You need to do a detox. Get Carol Vorderman's book. Do it for a few weeks if you can, then gradually introduce ONE type of food that usually causes intolerances. Wheat often causes bloating, so that should be one thing you absolutely avoid on the detox and then see if you feel better. Dairy causes some people problems too, so see if you can avoid that. Then introduce one thing slowly. Come back on here if you want ideas of things to eat during the detox- going without bread is the hardest thing, but you soon learn to adapt and have Ryvita, rice cakes and oat cakes instead!