When you stop Zoloft too rapidly a withdrawal syndrome may develop. Symptoms you may be experience are nausea, tremors, lightheadedness, muscle pains, weakness, insomnia, and anxiety. Most people coming off Zoloft have none of these symptoms, some people do have one or more. The symptoms may last 1-2 weeks but in some cases the symptoms gradually decrease over a period as long as a month. I would still recommend that you taper off this medication slowly under your doctor's supervision. Please talk with your own PCP for specific instructions.