If nothing else, know you aren't in it alone. There are tons of people here that go through similar things, and if nothing else they can be people to lean on when things are their bleakest. In that regard, I'm glad you've made it here and if you do need an open ear just drop a line, either via forum or DUmail.
I know that's no substitute for the real thing. It's about taking small victories where they are available though, I suppose.
I've got other thoughts, but I tend to prattle on without end.
I guess, the one piece of advice I have is the advice all the counselors and therapists always try to instill in me. Try to find things that make you happy, if only to find an escape from the negativity. If you can avoid the negativity long enough and replace it with happiness... maybe you'll find yourself on the other side of this funk in time.
You're never alone though. You've got us, if you'll have us. 
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