Hey Tetrax
When I feel things are intolerable I look around and find people who have it way worse than I do.
I'm not downplaying your feelings but honestly man I can't let myself get too far down the self pity rabbit hole.
Its never a good place for me to be.
Exercise helps me - I have a few options - if I'm unable to walk, I go some hand weights, or the stationary bike, or mat exercises (bridges or whatever).
Even when I don't feel like reaching out, I'll reach out to help someone else, That helps me too.
In the old days I'd watch a relapse come towards me like a rabbit caught in the headlights of an approaching semi trailer.
I learned the importance of action - even when action is the last thing I want to do.
Glad you feel a little better today
D