Talk about being between a rock an a hard place, tough position to be in. I'd like to smoke again too but like the thread above anxiety takes over and I can no longer enjoy it, sucks.
Our daughter has some difficulty with depression and mood swings, she uses a combination of Sam-E and a homeopathic dose of mineral lithium (very mild unlike the pharmaceutical). This works very well for her, may not be your solution. The Sam-E improves her mood, the lithium keeps things stable, we think.