Hi. Thanks for your query. Noted the history and understood the concerns. Very bad smelling gases leakage without control can be a social problem as you are facing. The commonest cause is bacterial flora imbalance in the intestinal tract. Some of the foods and beverages not suitable for your intestines. I would advise you the following: Send the stool for tests for three consecutive days. Ultrasonography of the whole abdomen. Consult your Doctor to get a course of an antibiotic, metronidazole and probiotics. This may help you drastically well. Also start taking carminative and digestive enzyme preparations. Activated charcoal tables also help a lot. Most important is that you have to find out the foods, additives and beverages that cause such a problems and you have to stop these strictly. This will help you further.