Persistent stomach pain despite normal tests is often due to functional problems like Irritable bowel syndrome or acid-related issues like Gastritis. Medicines like Rifaximin, Darolac, and Ondansetron may give temporary relief, but long-term control needs diet changes (avoid spicy, irregular meals), stress management, and sometimes acid-reducing medicines. Since pain returns after stopping treatment, consult a gastroenterologist for a structured plan rather than repeated short courses.