What Causes Stomach Ache And Vomiting Persistently?

my 6 yr old son had a belly ack yesterday and complained of not felling good. now he woke up pucking and has done so more than 5 times within an hour...he says he just dont fill good...also he munchend he had gottn some hand sanitizer in his mouth @ school yesterday but he was complaining of a belly ache the day before.......