You know what, I could've written that post myself. I used to cycle 500+ miles a week & now i'm lucky if i can do 100. It took me an eon to find something i'm good at & now it feels like i've been mugged of that.
You're not alone mate.
Grumpygit ive gone kinda Ketogenic/ atkinsey it’s made a difference , my fibro’s not gone I don’t think it ever will ?but it’s heped a tidy bit , anything I find of help I send with good wishes to the forum