Have you had a blood lithium level checked recently? If not, I think you might discuss this with your doctor. It is possible to develop a toxicity with lithium if your dose is too high. On the other hand, it needs to be a therapeutic level and a blood test can answer these questions. Hang in there. I'll bet if you being rx'd a lower dose now you'll be better shortly, but it could take a couple of weeks. I know, it must be really unsettling for you. It may just take time for your blood levels to go down and to feel less shaky and scared.
The Lady Dragonfly
Yes, it was me...I know because I was there when I did it. Lupus sufferer, bipolar II sufferer. Currently on Indocin for chronic pericarditis related to lupus, and cherishing every deep breath without pain. Currently in graduate school for mental health counseling, class of Fall 2007. Vegan and loving it!