Laws Of Attraction by Sandra Anne Taylor
The Seven Spiritual Laws of Success by Depak Chopra (but it's kind of "out there" with no proof behind some of the things. It's saying to trust Nature.... if you believe in God you could substitute God and it would be a helpful book. If you don't, then I'm not sure how you can "trust" nature)
The Four Agreements by Don Miguel Ruiz (I think that was kinda out there too, I forget...)
If you're Christian there are a lot of books. And also more than ANYTHING what got me happy again was watching sermons on tv by Joel Osteen. You could go to joelosteen.com to check it out or watch it on tv. Honestly it is more helpful than anything else I have done by far. It would help non-Christians also becuase it's not him preaching constantly, it's basically CBT in a sermon. He just backs it up with Biblical references about how people are "supposed" to let themselves feel good and other such things. Bottom line is if you're not Christian you still could get something out of it, but if you are Christian it is much more powerful because you have someone to trust and more reason to "let go" and let things happen and understand they will be good. It's nothing like a normal church service. Everything he teaches is CBT related, but of course everything CBT related does have its origins from the Bible rather non-Christians want to admit it or not. The Bible talked about not worrying, not feeling guilty, and thinking properly. You just have to know where in it they are said.