Hi,I'm 28 and of average weight for my height. I consider myself fairly fit and healthy apart from one problem. For over 2 years now I have been suffering from severe nausea after eating food. The symptoms aren't quite as bad after breakfast or dinner but after lunch I can feel really really unwell. About half an hour after I finish my meal, the symptons will start - Nausea, I start feeling unusually exhausted, slightly dizzy, my heart seems to race faster than normal. I can get bloated and I suffer from indegestion a lot more than I used to. I have extreme excess gas and burp a lot after food. I don't really suffer from diarrhea or constipation. After 3-4 hours the symptons will subside and I will feel back to normal until the next time I eat. I am like this every day. My work is now starting to suffer as it's wearing me down so much.I had an upper GI endoscopy about a year ago and all tests came back negative and clear. (As far as I'm aware they also took a biopsy). Since then I have had numerous blood tests for all kinds of things (H pilori, and several other rare conditions,) everything seems to be normal from those results. My doctor says we're now back to square one and I'm beginning to get desperate.At the moment I am taking ZotonFasTab, as my GP wants to rule out a stomach acid problem. After 2 and a half weeks of taking it, I'm not really noticing any difference.I have done extensive research on the internet and one of the conditions that keeps cropping up is wheat intolerance. I seem to have every symptom on the list but my GP seems to rubbish it every time I talk about it. I had a blood test the other day to rule out celiac disease (which came back negative), so my doctor is now saying that it can't be at all related to wheat. The only other thing that sounds similar is IBS.The only other thing I can tell you is that if I eat sweets (even just a couple), or to a lesser extent, chocolate, I will get hugely bloated and I get a massive build up of gas. (which is a bit embarrassing!).Any advice on where I should go from here is appreciated. I really want to try and rule out IBS before going any further.Thanks for your help.