How are you? Zoloft or Sertraline belongs to a class of drugs called selective serotonin reuptake inhibitors (SSRIs) which is indicated for treating depression, obsessive-compulsive disorder (OCD), panic disorder, and post-traumatic stress disorder (PTSD). The most common side effects of sertraline are sleepiness, nervousness, insomnia, dizziness, nausea, tremor, skin rash, upset stomach, loss of appetite, headache, diarrhea, dry mouth and weight loss. What you are experiencing right now may be caused by the side effect of this drug. If it persists, inform your doctor for proper management. Take care and best regards.