He could have a piece of shed stuck in his nose which can make them wheeze and pop. That's why Dr Del said just watch him for now. Once he sheds, take note if he's still wheezing. If he is, and/or if you notice any mucus around his mouth or nose or smeared in his tub, take him to a vet.

A good vet should not be a "mixed bag". There are antibiotics that can be quite effective. Most of us will deal with an RI at some point in time or another. It's not the end of the world if treated promptly and properly. A good vet will do a culture in order to choose the most effective antibiotic to use the first time. If your vet does not do that, request it. Keep the temps bumped up that teeny bit for now and try to relax. Even if it is an RI, you've most likely caught it early and everything will be fine. Keep us posted!