Hi Dear, Welcome to HCM. Understanding your concern. As per your query your son have severe abdominal pain along with vomiting . Well the symptoms you mention in query can occur due to may reasons like food poisoning , food allergy , infection of digestive system , gas , acid reflux , stomach flu or colic . I would suggest you to have your child lie quietly sips of water or other clear fluids , avoid solid foods for a few hours try small amounts of mild foods such as rice, applesauce, or crackers and do not give your child foods or drinks caffeine , carbonated beverages , citrus and dairy products. If condition doesn t get better then consult pediatrician for proper examination . Doctor may prescribe antiemetic drug , antibiotics ,analgesic and antacid . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari