I wonder if it would help to acknowledge that you are doing more than you give yourself credit for. You are taking care of your kids. You're reading court documents and showing up. You're going to appointments. Depression and lack of energy can be caused by heart problems so it's really good you are seeing your heart doctor.

Kind of random, but you might check out a book called 'Executive Toughness.' I recently read it and have found it extremely helpful in breaking my own patterns of inactivity. I am also a huge fan of timers like Rose76 suggested. I'll even set timers for 5 minutes on some projects because that's all I feel like I can cope with. Momentum is so important.