First, best of luck with the eye issue. IME, eye issues are rather inherently scary.
I don’t have a lot to offer that hasn’t been thoughtfully and compassionately offered already, but will endorse the notions of meditation and exercise.
Nothing has ever been better for my overall well being than exercise – tilted heavily toward aerobic stuff (running, cycling, etc.), but I did get more into strength training and yoga as time marched on and my body requested some concessions.
I also had to leave work abruptly (disability). After a 24/7, high-intensity career, I was worried about the sudden stop. I spent ten days at a Vipassana course, and then the next two weeks at a Buddhist monastery.
I think the benefits, for me, were huge.
Did I become a ‘skilled’ meditator? No. Did I develop a lifelong practice that has stayed with me and nurtured me every day since? No.
But I got another arrow in my quiver, and I still reach for it rather frequently.
My health dictates that my exercise options are woefully limited now. I feel the distinct difference for what I can no longer do. Now, I manage by brute force. It’s … suboptimal.
With life and job and family, not everybody can regularly do any kind of exercise they want, but if you can find something that you enjoy – particularly if there are minimal barriers to entry (eg, running is generally just ‘lace up your shoes and go’) – it may pay big dividends.
And if things like exercise and meditation aren’t already habitual for you, if you can manage the discipline to keep at either/both for a while, they may very well become habitual.
Good luck with all of it. I suspect your OP resonated with lots of us to some degree.