I also lift, and I've written and published some fiction that's basically Hawkmoon on a Harley, but when I get as burned out as you seem to be, I can't do anything resembling intellectual or creative work.
Or, rather, I can, but just slowly and half-assed.
It sounds like you need at least a weekend where you do absolutely nothing, like post-hypnotic Peter Gibbons in Mike Judge's 1999 accidental documentary Office Space. Just sleep. It sounds like you're worn the hell out.
It also sounds like you're killing yourself to live.