Gastroenteritis

I am a 37 year old male. I have had what I was told was severe bouts of gastroenteritis. The first occured Feburary 2006, and lasted 10 days. The second occured Feb 2007 and again lasted 10 days. This occured 3 days after an endoscopy. The most recent was April 2007, 5 days after a hernia surgery. This episode lasted 14 days, all were crippling, leaving me in bed for the whole duration. Symptoms were most intense in the morning, easing in the evening. Since this last instance, I do not feel like I have fully recovered...I have severe pains in my abdomen and periodic nausea and diahreah. Also, I have developed severe anxiety as a result of the illness, and am terrified it will return. I cannot stress enough how horrific the experience was. I have been to my gastroenterologist and he says nothing is wrong. I had bloodwork, stool samples taken, a ct scan and xray, all coming back negative. What is wrong with me.

Just an Update...could these continuing symptoms be just the Anxiety?