2 Year Old with Chronic Vomiting & Swollen Abdomen

I have a two year old son that has been sick with whatever this is for almost a year now. It started in January 2008 with another episode in May 2008 and now again in September 2008. We have had tests run, a scope surgery you name it and still no solid diagnosis or how to treat it. His symptoms consist of vomiting (mostly undigested food and a very distinct terrible odor - not like a stomach flu), watery bowl movements and immediatly after eating whether it be a meal or two bites of a cracker his stomach swells up like a balloon and within a few hours he vomits, then we start over again. He has been hospitalized twice resulting from this condition, one time he was diagnosed with TEC and temporary bone marrow disorder that they said could have been brought on by this chronic vomiting. My pediatrician has given us medicine for gastritis and also Prevacid to no avail. He has been tested for Pylori that were negative back in June of 2008. We are very frustrated at this point since this seems to be coming on about every 3-4 months. What can we do to prevent this, what are we doing wrong?  

[debbi47]

has he been tested for celiac disease  or cyclic vomiting

[naturesmusic]

my 12 year old daughter was said to have acid reflux and put on meds but it never stoped the vomiting i took her off the meds as all meds have side affects i gave her a digestive enzime and organic apple cyder vinigar twice a day for a month and tested her acidity level and she was fine far as vominting goes she had a operation to stop it but she still does it comes and goes they don't know why they asked latley if any one ever told me that her stomach was on the wrong side i said no he said there might be a kink in the tube stoping her food from going down  she is on med for to push her food along because she would have a 8pm feeding and vomit it up 7am she is tube feed with a g tube now talking j tube i don't want that i saw a show recently about a normal child all of a sudden start vomiting in the middle of the night it started and got worse and the child did not remember after a long hard road of doctors they figured out it was seizures causing the child to vomit my child takes seizures also i hope you find answers i am still looking what do you do when the doctors don't know keep looking good luck