Wellbutrin and Zyban are trade names for bupropion. They're the same thing.
I've been taking Wellbutrin for a few years, and have had none of the effects you cite.
I have heard that the side effects vary from person to person, like with any other drug.
Thanks for the info...since taking it bugged me, I know not to bother with the googling for more info on bupropion.