Depression isn't your fault. Unfortunately people don't understand depression; one big thing it does is sap all your energy. I think part of the reason is they confuse the temporary feeling of being down which they can snap out of, with the disease. Have you talked to your shrink about ECT? Frankly I will do whatever it takes to climb out of the hole. What works for me is getting active, fast walking. In the meantime try to understand that it's "depression think" that is telling you lies like it's your fault. NOOOOOO.