I've been taking Wellbutrin for about a year and have switched to...

I've been taking Wellbutrin for about a year and have switched to the generic Bupropion XL for the last 6 months due to my insurance. After reading all the reviews here I finally realize what is happening to me. I am more depressed than I have ever been. I feel like a zombie, very tired, INCREASED appetite, forgetful, cant think and basically don't feel like talking or being around anyone. I can go a whole day at work without saying a word to anyone (except when I have to of course) I don't want to go out or socialize at all. I started taking only 1/2 a pill to wean myself off slowly. I had tried Lexapro but didn't feel any different. I also took Paxil a few years ago & I think I felt a bit better & also felt more social but it did make me feel like a zombie as well. I kept tripping & running into things as well. Ugh. Is there any medication thats works?