Dear rebeccatilley You have not mention how old is your grand son. I think he should be admitted to hospital. He needs further investigations. In the history you mentioned he vomited, he lost colour
of his face, unresponsive , lethergic all gives me an impression he is dehydrated. In these
circomestances he needs IV drip to correct
dehydration which is vitally important. He probably
had a viral infection of the stomach as your doctor mentioned. Please let me know if you have got any quiry. kindest regards Dr.S.K.Mukherjee