I note from your letter that you are suffering from symptoms of dyspepsia, proven to be positive for H. pylori infection and that you have had various combination therapies but your stool is still positive for the antigen. The ideal thing to do is to continue receiving different combination of the antibiotics as you are rightly doing in the hope that you will soon be H. pylori negative. I feel one has to keep an open mind and consider other causes of gastritis. It is quite possible that you are getting recurrent re-infection and that your stomach is prone to get recurrent ulceration, though unlikely. You need to get endoscopic biopsies cultured, if not already done, to look for bacterial sensitivity to an appropriate antibiotic. It is also important to get blood test done for a hormone called GASTRIN, produced by endocrine glands, which raises the acid in the stomach to very high levels and cause recurrent ulcerations. The fact that you are receiving frequent therapy, might well have suppressed the formation of a full ulcer and showing only gastritis on endoscopy. If the gastrin levels are high you need to consult a gastroenterologist for further investigations. Next, it is very important to get recurrent biopsies from the gastritis area as there is also a condition called chronic gastritis which is independent of H. pylori induced gastritis and may be considered pre-cancerous. This would mean regular endoscopic assessment and biopsies.