Picked up my 7 y.o. son from school Tuesday.  He seemed tired & warm to the touch. He would not eat and went straight to bed. During the night he continued to vomit & gag whatever he had in his stomach. Water, meds. I gat him a suppository which did bring him comfort. The next morning.. He was better & by evening he seemed fine. Could it be food poisoning, flu or food allergy?
Most likely your son is suffering from food poisoning or acute gastroenteritis. Unless associated with bloody stools, the condition is self limiting. It is unlikely to be flu or food allergy. Give ORS (Oral Rely Chat Doctor.  It comes in ready-made form or may be prepared by mixing a full sachet in the designated amount of water. Replenishment of the lost water and salts is the mainstay of treatment. Unless that is done properly, the deny