I suffer from stomach discomfort and cramps. How to treat this condition?

Hello , hope you're doing well! I can understand how frustrating it can all be to have under gone a number of investigations. Your history of prolonged illness with normal investigation results suggests an underlying diagnosis of gastritis/ irritable bowel syndrome/ celiac disease. However , a detailed history would be needed to reach a definitive diagnosis. Stomach pain relation with food,improves or deteriorates with eating? intake of spicy or junk food? Are you suffering from bloating,altered bowel habits,abdominal cramps improves on defecation? During treatment , did you at any point felt better with certain medication? if yes ,kindly mention the name! For now, continue taking Rifaximin if your symptoms are controlled with it . or else follow the medication plan I am writing below. I really hope you get better by this! Best wishes.