I am a 34 year old man who has been having a problem for about 2 years now. I seeem to have a tightness in my stomach, sometimes accompanied by cramps and a feeling of always being bloated. I have been treated for parasites and been on all sorts of antibiotics, but the symptoms seem to subside a bit. The tighness remains. My doctor has asked me to stay away from citrus fruits, bananas, diary products and lately any fatty foods. I have not had any food allergies and am desperate for a possible diagnosis, or at least a shortlist to work from. I have recently just had diarhorrea which was frothy and smelled strongly of ammonia. Please help!