Two months ago I was fine and then had an episode of sudden stomach pain followed by almost passing out.  Since then I have not been the same.  Have done Stress Test, Echo, halter monitor, Ultrasound, CT Scan, Chest X ray, upper endoscopy, colonoscopy, and diet consists of no dairy, sugar, yeast, gluten, soy, caffeine.  Have only been able to eat about 800 cal a day for over a month and a half.  I also now have low blood pressure and upper abdominal pain as well as gas and bloating. (previous to the attack two months ago, I had been on several different antibiotics for an infection-three weeks prior to the attack).  I have never had these symptoms (upper abdominal pain after eating or drinking, extreme fatigue, low blood pressure, gas) or problems in the past.  Now they are debilitating.
HI. Read an elucidated history carefully and repeatedly. I could think of this cause is ::: Gastric volumes and can be confirmed only by:Barium study for stomach in headlow-position. Get this done you may get the diagnosis.