Thanks for your question on Healthcare Magic. I can understand your concern. If examination for reflux and colonoscopy are normal then no need to worry for major abdominal cause. Uncontrolled stress, anxiety and panic can also cause similar symptoms. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in his life and start working on it s solution. He may need anxiolytic drugs too. Ask him to avoid stress and tension, be relax and calm. Don t worry, he will be alright. Hope I have solved your query. I will be happy to help you further. Wishing good health to your son. Thanks.