What I found over the years is that having a routine helps ward off depression, and by definition almost making something isn't a routine it's a one time event.
I would suggest something much simpler. Walking. Take as many steps as you can every day. Log the results, but really you just want to do something to get you moving so the results don't matter, I just like to compete against myself and walking is something I can do just about any day.
Eventually you will feel like doing something other than walking, but there may be weeks or months or you don't -- and that's OK too.
The point is just not to lie around letting the self-destructive thoughts spiral and lock you in that place you don't want to be. But even when you're there, you can still put one foot in front of the other...