Hi, this is a basic symptom of various psychological problem, for better management a proper diagnosis needs to be formed, kindly visit the near by psychiatrist or psychologist in order to prevent the  worse scenario.

Tremors, feeling anxious or nervous, sense of panic, sweating, increased heartbeat, feeling of impending doom, stomach discomfort, dizziness etc are signs of anxiety. These can be debilitating. If the anxiety is overwhelming, consult a Psychiatrist at the earliest. With the right medication and counseling, it is likely your symptoms will improve.