Doctor, My son is four years old, yesterday we went for a marriage party where he ate fruits and cottage cheese. he had slight cold at night, as he had bathed in the rain. in the morning he had milk and went to school. He vomited thrice in school and after that he had a banana, puked, I gave him a slice of pear he had, slept for an hour, got up and threw up, then even boiled potato and water. he is not even retaining water. What should I do? Should I give him Ondem and what and when can I give him something to eat? Please reply urgently. Thanx. Dr. Mathur