Make a realistic plan, one that you can potentially reach in a few years, and tough it out with that goal in mind.
I’m glad you are in Canada, instead of here where unemployment (or under-employment in my case) means no health insurance. 
but, yes, talk to a doctor for sure.
If the problem is employer or office related, I definitely agree that you should start looking for a job asap. I was in one job where I worked 13 hours, got no credit, and had a psycho boss. I switched to a new one and all was sunshine. Think “it’s not me, it’s them.” It probably is.
I hear you.
You need a change. And you REALLY need a change! Whew.
Lots of people go through this around your age-though you are having it especially tough. Find another job. Think of yourself as laid off and they just haven’t stopped the checks yet. Get out, that is what you need, and find another job in a different field. At this point money isn’t critical. Change is. As others have mentioned, finding another job is easier while you have a job so you have that going for you. It would help if you have a very understanding boss who will help but it isn’t necessary. You are wounded and you need to stop the bleeding of your energy. Change. it is the only solution that will help - in my opinion.
Leaffan, I agree with those that suggested taking a month off. It sounds like you need to recharge your batteries. You could start with one month & go from there. One month may be enough. I would look hard at taking longer than that. When I had had it with my job, I took three months off. Like you, I had a years worth of savings. I also had my wife’s blessings, as she could see my mental state, & it was not good.
Time off is good. Although, for some folks this time of year is a major downer. I hope that this season does not affect you that way. Myself, while I dislike the Christmas season, it does not depress me.
During this time off, I went fishing & trail riding in my Willys pick up. Some days, I would just go sit beside a river & not even get my line wet. I read a lot of books. We lived near the ocean at the time, so some beach combing was done as well.
What I am trying to say is, go do some of the things that are enjoyable to you. Even if these things cost a bit of money, go do them! It is worth the cost.
Hang in there, we are pulling for you!
I’m a similar age and work at a job I loathe. Living in a rural area and with few marketable skills, I have buckley’s chance of getting another one. Also, I work from home, and after these years of minimal human contact, I’ve turned into a bit of a misanthrope and would probably manifest as a total psycho if I had to actually work in the physical presence of others again. 
But I keep working with a goal. And that goal is to go on a decent holiday twice a year. I don’t have any savings as such, but as soon as I see some cheapo airfares to somewhere in SE Asia, I bung them on my cc and pay them off. And then I have to work to save up the money I need to pay for the other expenses. Seriously, it is the ONLY thing that gets me up in the morning and working…
Can you maybe set yourself some short-term goals that make the work-day go a bit quicker and with a tangible REASON for working at a job that is disheartening?
For me it’s now travel…but you might have other stuff that can help motivate you. 
Oh, Leaffan, I am sorry for you. You have access to very smart people (excusing myself, of course) here on this board. Take their advise, get help, take a hiatus, and let us know how you’re doing!
It’s not clear to me whether the problem is this particular job, or that you can’t face the idea of any sort of work. The two problems require very different solutions.
Leaffan, you say you’re fed up and emotionally drained. Would you mind sharing what you’re fed up with? Is it a horrible boss, or too great a workload, or something else?
Several people have already suggested that you take some time off. I think this is a good idea - you’re obviously burned out, regardless of the source of your problems. I also agree that it would be a good idea to see a mental health professional.
Hang in there. Be good to yourself.
I was under the impression that, in Canada, you can retire at 55. Is this incorrect?
Having a job you hate - even when you recognize that you are fortunate to have a job at all - is all kinds of suck.
Hope everything works out for the best for you.
mmm
Yeah. I realize I gave a lot of advice without realizing Leaffan was in Canada, but I left it, because I wanted to keep the part where I asked essentially the same question. If the problem is a co-worker, maybe Leaffan needs a lateral transfer, or a conversation with a supervisor. If the problem is a subordinate, Leaffan may need advice from a supervisor. Maybe the person needs to go, which is a really stressful decision to make; but maybe the subordinate can be transferred to some place where he will get along better. If the problem is a supervisor, again, maybe a lateral transfer, but harder to do, because you can’t ask the boss for help. If the problem is big enough, maybe you have to go up the chain of command. I’ve had to do that, and it’s dammed hard, but it did save my sanity once.
If none of those sound right, then it’s just the job. But again, is it the workload, or the job itself? I had a job I liked once, with an unreasonable workload-- that’s the one where I had to go up the chain of command, and I got all my co-workers to go with me. It’s kind of a long story, and not really appropriate for Leaffan’s thread, but I will tell it to anyone who wants to PM me.
Does Canada have anything like the US’s Family Medical Leave Act?
Even if it doesn’t, it probably is in Leaffan’s job’s best interest to give some kind of leave to a trained employee who is theoretically coming back, than to hire someone new who needs to be trained (expensive).
What I can’t say is whether it’s better to go in armed with a doctor’s note or not. Having one probably guarantees you will get what you want, but it will also get you labeled as a special snowflake, so maybe it’s better to ask for it without, then move to a doctor’s note only if they say no.
Regardless, Leaffan should still see a doctor. This could be depression or anxiety making work difficult, and work itself isn’t actually the problem.
I’m not sure what’s covered by FMLA, but Canada contemplates different types of paid leave for medical or family reasons (for reservists called to duty, as well).
Not sure what would be needed for one or more weeks of “mental breather”. That’s the kind of thing that tends to vary more by company or manager policy than by official regulation. The one time I had a stress-related illness (basically caused by my manager deciding to be a jerk), I took a week of medical leave officially related to the stress-related illness.
Remember earlier he was accused of drinking on the job. That would stress me too.
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I’m rather upset about work. Someone reported me for drinking on the job.
Wishing you the best, dear** Leaffan**. Some days I start to write that same OP.
That’s the federal labour standards. It only applies to about 10% of workplaces. Most labour standards are provincial, so it would likely depend on Ontario law for Leaffan.
Would provincial standards be “at least that” or could they cover less?
This is what I did, and the reduction of stress is more than enough to make up for the reduction of income. We cut our lifestyle costs, so we could afford to start our own business. I currently work part-time for the USPS to supplement our income until the business brings enough in for us to live solely off that. It’s been a bit of a bumpy ride at times since I left my high-paying, high-stress job four years ago, but I wouldn’t go back for all the tea in China.
Simplify, simplify, simplify. Just cut the fat out of your lifestyle, and go for stress-free jobs. Think Peter Gibbons at the end of Office Space. There’s so much more to life than money.
ETA: The biggest point of stress has been dealing with health insurance as a self-employed family. But since you live in Canada, you don’t have to deal with the nonsense we have down here.
You’re a sharp guy, and generally present yourself as practical and common-sense oriented. You have to tools to suss out what is the best of the options available to you. Happy to talk them through, but you’re not going through anything terribly unique, tho your specifics undoubtedly vary.
Make sure you identify short-term and long-term implications. Identify any others who would be strongly impacted (rather than disapprove or inconvenienced) by your choices. In my book, that is pretty much limited to current spouses and dependent children. Absent that, your primary responsibility is to yourself.
What does the current job provide/impose? If it just sucks, but provides decent pay and does not intrude overly on your off-time, maybe you just suck it up. If it is turning you into someone you don’t want to be, then make a change.
In any event, I’d imagine simply up and quitting without any fallback job prospects would be low on my list of recommendations. Like someone said, if you HAVE to get out, find something else first - even if you do pull a Kevin Spacey from American Beauty. 
Provincial standards could be higher than federal, on par with the Feds, or lower. Each level of government is sovereign within its own sphere, so the Feds can’t set minimum standards for the provinces.
I resigned today: flat out with no notice.
I have barely eaten or slept in the last three days over this. I’m starting to feel more relaxed already, although with mixed emotions.
It was everything about that place; no management support. A smug, holier-than-thou attitude from management. Hell, my title was Quality Manager, but I wasn’t invited to the management meetings.
Recall that I started a thread that one of my colleagues reported me to management because she thought I’d been drinking on the job, in the morning even!
Trying to implement an ISO9001 Quality Management System with no support from management just wasn’t going to happen. It got a bit better a couple of months ago, a bit, but then after a week the communication and support stopped.
So, I’m taking a month or so, and yes, I didn’t burn any bridges at my last place.
Thanks for your support.
Doug
Good Luck. Enjoy your time off.