Mac, why don't you see this as a time to make a new start. When I hit 60 nearly 2 years ago I felt terrible. I was 40% overweight, alone and lonely ( as , like you, I've been all my life) had chronic stomach problems which I had convinced myself was cancer and I was generally going downhill. I saw it as a time for change. I changed my diet, started exercising ( firstly at home and now at the sports centre- which has become part of my life). I had a colonoscopy and they found some pre cancerous polyps which they removed, I've had skin cancer which I've had 2 surgeries for and , touch wood, it won't come back. Health and fitness wise I feel the best I've felt for a long time. mentally the underlying existential depression is still there and I doubt it will ever leave me. Exercise helps .....to a point. Do I wish I wasn't here... sometimes. Do I think about suicide ...sometimes. Do I feel alone in an uncaring world.... all the time.
Mac, in all your posts you seem to identify as old. I don't know how old you are but i'm sure you're not that ancient. You can exercise with a bad arm. If you convince yourself that you are old and immobile you'll never get out of that chair. I do 'body combat' at the sports centre and keep up with people half my age. So keep us posted and .....good luck