Be careful with the wellbutrin -- since it's a pure antidepressant, it is stimulating, and is known to cause anxiety. Keep a careful watch on how you react to it. Now what I'd recommend, but I'm just a sufferer, not a clueless psychiatrist. Do you have depression? If not, wellbutrin is a strange choice.
It is frequently used for anxiety along with depression, and seems to help with the anxiety in a different way than the valium.