My son is 6 and has been vomiting at least once a day a few hours after he eats. The doctor gave him an acid reducing medicine but its not working. Any ideas of what it could be?

I'm sorry I have no answer yet but I might be able to help if you help me with some more information.

Has your son been eating different foods since he started throwing up? Does he always throw up a certain kind of food or is it all foods? Have you been to a restaurant (including especially fast food) recently before you noticed him being sick?

This may be food poisoning, but as I said, I don't know enough.