A.Y.
It sounds like this may have turned into something else during the week. In my experience, when a fever comes and goes, and there is a wet cough and runny nose, it is very likely to be an ear infection. Is he having trouble lying down at night? Ear infections can develop very quickly, and the intermittent fever is a dead giveaway for infection. Suggestion? Call the pediatrician's office, explain that you were just in with your son, and he's gotten worse, you suspect him of having an ear infection, and ask them to prescribe him an antibiotic. If they insist on you seeing the NP, express your worries about her, and ask for them to have the Doctor call you asap. Be sure to ply your son with lots of water, ibuprofen, and lots of yogurt while on an antibiotic, to help soothe his stomach and to avoid yeast infections. I hope this helps!