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I'd say that could help. I'm not a doctor, so I'm going off my own research and experiences. Just be careful because you don't want too much serotonin either.
Also, look into your diet more. The Mood Cure, which was reccomended by my clinical psychologist, talks about your neurotransmitters and diet. I'd reccomend looking more into how serotonin is produced as well. A good diet, protein for sure, helps with serotonin as much of it is produced in your gut, which is why people experience GI issues with SSRIs.
I know it seems bleak right now, but consider the possibility that there is a simple solution to your depression that you haven't found yet.
For me is was this book: The Mood Cure
Refined carbs and sugar in the modern U.S. diet will fuck you up in a million ways you wouldn't believe. The first day of following this book's advice all I could think was: "This must be how normal people feel ALL THE TIME."
While I think this is something you should try, it's also an example of how simple the solution could be for you. Keep looking for something that makes you happy. When you find it, look for something else that makes you even happier. Eventually you'll have a bearable life, then a good one, then a great one.
Fix the depression via diet, with The Mood Cure then have the energy for fitness and leaning out.
I've suffered major depression and anxiety for decades and treated it with alcohol. I've tried wellbutrin and prozac; both are addictive. I decided there had to be a better way and I found:
"The Mood Cure" http://www.amazon.com/Mood-Cure-Rebalance-Rediscover-Well-Being/dp/0670030694
(I'll post this for anyone who stumbles across this post) "7 Weeks to Sobriety" http://www.amazon.com/Seven-Weeks-Sobriety-Alcoholism-Nutrition/dp/0449002594/ref=sr_1_1?s=books&ie=UTF8&qid=1305593743&sr=1-1
Go talk to someone, get a diagnosis and see about the appropriateness, for you, of nutritional therapy.