Samantha,
Im am on zoloft 100mg and my feeling is that you should probably just wait it out. Anti-depressants take 4-8 weeks before you really see any benifeit from them. I would also share your concerns with your doctor, I get the shakes, and tremors too, but i really think that it is probably due to anxiety. Also, when you were having the tremors, when was the last time you ate? It seems if i dont eat at least every 3 hours i get very shakey and light headed.
I hoped that helped.
Michelle