It is quite common to experience post-infectious irritable bowel syndrome or temporary enzyme deficiencies after a stomach flu. Since Pantodac (pantoprazole), probiotics, and psyllium husk have only given temporary relief, your gut may need a gentler approach. Try eating smaller, more frequent meals focusing on easily digestible, cooked proteins, and consider a temporary low-FODMAP diet. Keeping a food diary can help identify specific triggers. Please consult your doctor to discuss these symptoms; they might suggest temporary digestive enzyme supplements or testing for SIBO (small intestinal bacterial overgrowth) to help get your digestion back on track.