Every couple of months my DS (5yrs) gets a cold, swiftly followed by a wet, phlegmy cough that seems to result in him having repeated vomiting over 2 or 3 days. He is often sick about 7 to 10 times during those few days. There's no diarrhea or temperature with it and it doesn't pass to our other children so we guess it's either a gag reflex thing with the cough, or maybe phlegm irritating his stomach, or both...or maybe something different we've not worked out? Has anyone else had this? Has anything helped? He's so miserable with it when it happens but is usually v bright between being sick. It seems that a bit of food is soon brought up again until it wears off after a few days and he's back to normal again for a few months.