Wellbutrin is a more enervating antidepressant (some are enervating and some are sedating), so it can definitely exacerbate any tendencies towards anxiety. For this reason, I also take Paxil along with the Wellbutrin; Paxil tames the anxiety portion. There is something called "serotonin syndrome" that can develop when you are on certain enervating antidepressants without an anti-anxiety med to counteract it; I had an episode of this, and it was the worst thing I have ever experienced, worse than a panic attack; I thought I was going crazy. I now know I need both components. It has been a life-saving combo for me, honestly. HOWEVER, since starting this combo, my sex drive has decreased significantly. Now, I must say, I had an unusually high libido before, so maybe I am more "normal" now, I don't know. All I know is it has been a very noticeable difference for me, but it has NOT gone away completely.
Hope this helps, and good luck!