My son is 9 years old and has had relatively severe nausea for the last 4 days but it is on and off. He s fine for a few hours then feels yucky for an hour or so then hes back to normal. He has not actually thrown up, just says that he feels like he is going to. On Thursday morning he had a low (99.3) fever and it was gone within an hour. He was also complaining about headache yesterday. The guy we saw at urgent care told me it was probably just something viral going around and gave him ondansetron but that doesn t seem to be helping.