I had the exact same problem and I was told it was IBS or Chrohns, or whatever! It was not until I had a CT of my abdomen and pelvic that it was clear that I had what is called "GASTROPARESIS"...I had to have surgery as they had to open my Pyloic valve so things would move..thats the problem, when your food is just sitting there in your stomache formenting, and not moving, it causes gas, bloating and very foul diareah after you eat. I would look this up on you tube and wikipedia to get details on Gastroparesis, see a Gastrentronologist Surgeon. Don't let the Docs waste your time like they did mine. I entered the essay contest so I could tell my story, its under Kimberly Radomski..this will tell you more about why I feel I know what you have. Best wishes to you and I would also suggest you look up Gastroparesis on this site too or start a discussion. Im here if you need to talk. Take care of you.