Hi, I am a student of MBA and I often have cramps in my stomach without any apparent physical reason, I start sweating profusely then. My hands turn cold. Pain killers help for a moment, but again suddenly it can start. I have checked with the family doctor, physically there is no such ailment that can be medicated, he is associating it with stress. What can this be? How can I cure it, if this is due to anxiety?