Hang tough man. I've been there more times than I care to think about. 40ft's right. It will get better. You have to believe it and move towards the positive things in your life. I know that sounds easier than it really is but it's worth it, even when those positive things are hard to find.

Keep looking.

Also, I don't know if you're a big reader or not but I would recommend 'The Noonday Demon' as the best book I've ever read on depression. It really helped me a lot.

Let us know how you're doing.