If you can travel then go to the best Clinic that is Number 1or 2 when it comes to GI issues because most GI Doctors doesn’t have a clue. Maybe you have leaky gut or food allergies. Try giving up all milk, and dairy products, stop eating all sugars including fruits and don’t eat gluten products for at least 2 months and take a pre-probiotic and make sure it’s dairy free sugar free and gluten free. You have nothing to loose by trying this and it’s for 60 days. If this doesn’t work then go and see a top GI Doctor. Also ask your Primary Doctor to order you a Ultra Sound of your arteries in your abdominal to look for and compression of your arteries.