my 12 year old, 150 lb, 5'1" son has a headache and stomach ache with fever off and on and chill bumps for the past 24 hours. he has eaten nothing in the past 24 hours, just drank some sprite and water. i gave him ibuprofen, 400mg, twice and a dose of pepto bismol. no vomiting or nausea, just abdominal pain.