post gallbladder surgery

I had my gallbladder taken out, while in recovery i had "flash pulmonary edema"  for an unknown reason i had fluid go into my lungs and i was put into ICU on a ventilator for a few days. I was later released from the hospital within 3 or 4days after that.. six months later I'm still getting the stabbing like pain in my right abdomen. It comes and goes without warning, it can very painful at times to breath and move around (lifting, moving side to side) what causes it? if i run or do any extensive exercise  or eat a large meal. and it will last anywhere from a few hours up to a several days. i just don't know what to do..