I’m actually going through the scenario the OP mentions right now.
My spouse had health problems when I first met him so I also knew that the odds favored me outliving him. Not only did I think about That Day, but we had also had conversations about end of life care, what to do with stuff, and so forth.
Yes, the planning and thinking did help. Some.
The biggest thing immediately after was knowing what to do in the immediate aftermath - how to access internet accounts, where information on bills are kept, life insurance information, deadlines for changing health insurance coverage, what things had be changed over to just my name first and which were not time critical. Both my physical and emotional health took a massive hit not only from his death but also the months leading up to it, which were one crisis after another. I had little energy, stamina, or focus and having a map of sorts did a lot to help me.
One thing I did immediately after the spouse’s death was speak to lawyer for about a half an hour about possible legal issues and pitfalls. That was time and money well spent and probably saved me a great deal of trouble and money down the line.
One thing I would definitely recommend is to get medical power of attorney and end-of-life instructions set up NOW, while both parties are healthy and of unquestionably sound mind. Don’t wait. Do it now. Especially if you think there is anyone on either side of the family that might challenge your authority to make decisions on behalf of your spouse and vice versa. You don’t want to be caught in a limbo where a decision needs to be made and no one can legally make it until the party concerned either recovers or dies.
As for the months after - I gave my self a year in which I would make no major decisions or life changes (unless, of course, I really, really had to do so). I find that doing so was good for me, as I had to rebuild my physical health and get used to be single again, I had a hundred little things I had to start doing again because now I do ALL the chores instead of being able to split them, and in general just allowing myself to recover. But that’s me. You might do well to downsize your living space in just a few months. What I do suggest is not locking yourself too tightly into a timeline for awhile afterward. Losing a spouse really does hit you hard, very hard. For months it was all I could do just to get up, get dressed, and go to work some days.
Things I’d recommend for the new widow(er):
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As I said, you’ve just had a terrible blow. Give yourself extra time for rest and to take care of yourself.
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GET OUT OF THE HOUSE. Even if you don’t want to socialize do so. I joined a lunch club and the same crowd now has me going to their grief support group, too. Even when I wasn’t going through I made a point to get out of the house every day the first four months or so, even if I had nothing planned.
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Keep working - having a full time job did a LOT to keep me moving and putting one foot in front of the other. I had contact with people, it was 8 hours of relative normal in my life 5 days a week, and it keep the bills paid. I don’t know how folks who don’t have a job (retired) cope.
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Don’t be too hard on yourself about going through Stuff. Initially I’d be able to go through His Stuff for about 5-10 minutes before becoming a sobbing mess. Now, much less of a problem. It does get easier with time. If you set a time line to get it done and you find it overwhelming then re-set the timelines. On the other hand, if you find it cathartic and helpful to attack The Stuff have at it.
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Everyone grieves and recovers in their own way. Do what works for you. I got a lot support groups pushed on me at first, none of which suited me so I didn’t go to them (I found one that fit 10 months after his death). Some people start dating again immediately. Some wait. Some never do. This really is about YOU, do what works for you.