I've been on Wellbutrin(300mg) for several years. Wellbutrin is know for being an "activating" medication, kind up gets you up and going, which could seem to some like a feeling of anxiety. It is used for depression, but it also has the bonus effects of helping people to quit smoking and to jump start weight loss. Just like any medication, it takes a while to get use to its effects. I had taken several different similar meds, but felt a lot more like a regular human being once I started taking it. My suggestion is to give it a try for a while, and maybe you just need some tweeking on the dosage. It's a really good medication, and there are not a lot of drugs I'd say that about, and believe me, I think I've taken most of them.
Good luck and let us know how you do.