Hello, The abdominal pain that he is feeling on right upper abdomen radiating to the back with no fever but only nausea is suggestive of bowel problems as he is not able to pass the gas too. Most probably caused by constipation. Stomach hyperacidity and colitis are to get further investigated through: • Abdominal ultrasound • Upper endoscopy • Liver/kidney/pancreas function tests Buscopan can relieve the pain, but can slow down the bowel movements, aggravating bloating he is having. I advise to give: • Antacid • Take some walk • Avoid foods that would increase bloating Regulating his bowel movements (BM) is the key to treat constipation and pain. Psyllium/prunes supplement can help together with gentle laxatives. I advise not to take another Domperidone pill unless prescribed by his doctor. If still unbearable pain and discomfort, should see his physician for further evaluation and treatment. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Albana Sejdini