Struggling with the same thing.
Book madness I like your 'done' list idea... I tend to overdo to do lists and get overwhelmed.
Baby steps is what I think I need to return to like what Fraiser said. Maybe I'll still make a to do list with only a few things, and maybe if I use something as a motivator/reward for getting x done. And at end of day I'll write out a done list as well...
I often still get upset that when I do accomplish x I feel like well I should have accomplished x,y,z... It's hard - the battle with depression. We can do it. ... Provide reassurance here....