I'm on Wellbutrin (150 a day). I haven't had the tremors, thankfully. I have gone through headaches, ears ringing, dry mouth... a lot of dry mouth.
My psychiatrist prescribed it for me for depression, and it worked for some time... but I can feel it is not working any more and I fear I'll have to go off it. He won't increase my dose because it does increase anxiety and I'm very sensitive to meds.
Wellbutrin is more for depression and not so much for anxiety. Pdocs are always the best choice for prescribing mental health meds.