Keeping a food and symptom dairy is always a recommended approach, especially when your not sure which food is causing the symptoms. If your symptoms to not subside though, see your doctor....he may diagnose you with Irritable Bowel Syndrome which is common when nothing specific is found in the stomach and gut area. Treatment is usually without meds and will be very much related to your diet and keeping a food diary to establish what you can or cannot tolerate. Diagnosing Coeliac disease is more invasive and needs a biopsy. You dont want it diagnosed unless its through this diagnostic procedure...trust me. Hope your feeling better soon.
Oh and thanks for the thumbs up Katyanna