Hi Dear, Welcome to HCM. Understanding your concern. As per your query your son have symptoms of diarrhea along with abdominal pain and vomiting. Well there can be many reasons for symptoms you mention in query like viral gastroenteritis , bacterial gastroenteritis , food allergies , lactose intolerance , giardiasis or irritable bowel syndrome. Need not to worry. You should avoid solid foods for a few hours try small amounts of mild foods such as rice, applesauce and do not take foods or drinks caffeine , carbonated beverages , citrus and dairy products. I would suggest you to consult gastroenterologist for proper examination. Doctor my order test like stool test , endoscopy , ultrasound and take history. Doctor may prescribe omeprazole , ornidazole , albendazole , laxative along with antiemetic drug . For now eat light and non spicy , take antacid after every meal and take light walk after every meal . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari