Hi, I read your question thoroughly. As you have all your investigations done and they are all normal, which means, the chances of a pathological disease causing the symptoms are less . so there is less to worry and more to focus. The major symptoms of abdominal pain, bloating, constipation alternating with diarhea, wind, are probably due to irritable bowel syndrome, which is a disease with no pathological changes in the gastrointestinal tract but it causes symptoms. anxiety, head ache and sweating can accompany these gastrointestinal symptoms. these symptoms to a great deal can be dealt with by life style modifications. a healthy life style with regular exercise with moderate diet changes( including less intake of caffeinated drinks, moderate intake of vegetables, eating small meals) can help a lot. You can consult your general practitioner for treatment plans and follow up. I hope you found this information helpful. If any further questions you can write to me any time. best regards! Dr. Abdur Rehman Alozai