Aye! but there is the fact that once you've hit rock bottom, there is only one way to go, and that's.....UP!
I remember feeling like that a few months ago, I was almost at the point of calling it a day. But I found the strength from somewhere to climb up, and look over the edge of the hole I was in, and saw a different view!
Ever since then, I've been working my way out of that deep hole, it's not been easy, but there's no way I'm going fall back into it now, good luck, and keep fighting.