Hi Dear, Welcome to HCM. Understanding your concern. As per your query your husband have symptoms of fever, chills and upset stomach. Well the symptoms you mention in query can occur due to many reasons like infection of the gut , electrolyte imbalance in body, food poisoning , inflammation of the gut colitis, food intolerance and various rare disorders of the gut. It could be due to viral pharyngitis. It is due to poor and compromised immunity of body. Need not to worry. You should do warm saline gargles and take steam thrice a day . Avoid taking spicy and sharp food. Avoid cold carbonated beverages. I would suggest you to consult gastroenterologist once for proper examination . Doctor may prescribe loperamide , laxative , omeprazole and antacids . For now give your child fruits like banana and lot of fluid. You should take oral rehydrating solution to maintain hydration status of body. Avoid intake of outside food. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari