I'm used to giving 110% all the time, because that's what it usually takes to do things like get out of bed and shower. But now, well, 110% of what I can do now burns me out fast.

This reminds me of James White's The Genocidal Healer and the situation the Cromsaggar found themselves in.

I'm sure it's hard to recalibrate. I don't really have any advice, other than what classics_cat has already offered (namely: rest, do some self-care, and try to cut yourself the slack you both need and deserve).