I'm sorry to hear your suffering. Sometimes when I've felt similar, one thing that's helped me is a knowledge I'm not always going to feel this way. It's knowing that the dark and drained state I find myself can't be permanent. There's always going to be a light at the end of tunnel, even if you presently can't see it.

For what it's worth I currently find myself feeling like I'm in a tunnel of dark misery. But I make effort to realise it's inevitable that sooner or later I'll emerge. I dunno if that's of any use; either way, try and do the right thing, and take care.