I have the same kind of depression you do. It comes and goes in stages for me, I'll be fine for months then suddenly wham, hits me. It really sucks. I just want to lay around and do nothing. I'll look at the clock and somehow 12 hours passed. It's like I have no concept of time and my brain just partially shuts off. I immediately hate myself afterwards for being useless. I feel exceptionally stupid trying to describe it, my mother tells me "Well just get out of bed and move, you'll find motivation!", so some people really don't get it. So I totally understand how you feel. Best of luck to you, hopefully you've found a way to cope with it.