I have been feeling a pulsation in my stomach since a month. It had disappeared in the middle but resurfaced. By pulsation I mean, it's like a heartbeat and I can feel the skin surface of my stomach move up and down. There's no pain right now but last month I had abdomen pain. That subsided and I was fine but yesterday I had a burning sensation and sting pain on the upper left part of my stomach, above my navel. It stopped after I drank two glasses of butter milk. My menstruation has been regular and timely through all months. This pulsation is very distracting. Please help.