Hi adamhere, welcome
Having had l4/l5 disc issues and other back problems I can understand. Also 3 long term relationships. My wife of 4 years is a pearler. Lovely lady. Stable and good relationship.
Time is your enemy now. You'll need to prioritise things. Get up and walking number 1, care for yourself, strive to return to work asap (being a previous investigator where much of my work was workplace fraud it pays to get back to work), and by then you'll feel better that time since your break up has been quite a while.
Then start dating again even if you don't want to. This is the best medicine for recovery of a past love.
You do have a fight on your hands in recovering. But as time goes by you will feel better. It's all about having the faith in yourself and making life what you strive for.
Thanks for writing in. It isn't easy at this time.