Yes Becky I know,Its Called ESSENTIAL TREMORS, its a very common symptom with BFS. Usually, it comes into the first months of BFS and then dissapears. It was my case, when I was stricken with anxiety and absolute panic, I even felt my whole legs shaking, it was very unpleasant , but in fact it did go away. You can also use the search tool and look for "shakiness" or "tremors" and you will see its totally common around here.Also, you can check another boards on this issue, I will recommend to you :anxietyzone.comThere are thousands (literally) of people with these tremors and shakiness, and remember also that you are on Day 4 of Zoloft, so therefore, those tremors could easily be an light side effect of the first days. Other side effects that you can expect are :-Enheightend Anxiety.-Hot Flashes.-Mild constipation.-Dry mouth- Weight Gain or LossIf you experience any of these, dont worry, they are temporary, but the good news is that the therapeutical benefits of Zoloft (Sertraline) outweights this temporary effects. Heres the link to the Pfizer website on Zoloft :Just Chill and PMe if you have other doubts,Ed