I'm experiencing stomach pain from almost 2 years. I've taken PPI, Antacids, Bismuth Subsalicylate for a month and extended PPI for another month. Doctor told me that my stomach pains due to stress and lack of exercise. So for solving stomach pain he suggested daily walking. But after a few weeks i ate a sandwich and now my stomach again started paining. Do the kidneys and not the stomach pains? The part just above and behind the pelvic bone on the left side of my body pains. I think this pain will never go. Please help.