Thats great you are feeling so much better! I just started on lamictal as well, at 75 currently but also on depakote which increases the effect. Not sure if lithium does the same with lamictal.

Did you have any time in between the wellbutrin and lithium? I didnt have tremors from wellbutrin but lithium gave me minor tremors that didnt go away in the 2 months I was on it. If you had tremors in between the meds it is likely still from wellbutrin though. Otherwise it might be hard to tell.

I dont really know anything about the thyroid levels but perhaps you might want to get more information on that from someone other than a pdoc so you know exactly what that could mean long term for you. Of course if you already have or feel you have a good enough understanding just disregard that lol