Absolutely take him to the Vet and as soon as possible. But just as important is that you take him to a reptile specialist. Not all vets routinely see reptiles.
The x-ray of the lungs being clear really means nothing. It doesn't need to be pneumonia (in the lungs) to be a wicked UPPER respiratory infection. So before you go, do your homework. Research and also call the vets, make sure a experienced reptile specialist vet will see your boy, esp. since this now seems to have progressed to something quite nasty.
Make sure that the vet does a culture. You all need to know exactly what kind of nasties you are dealing with. Most likely you will get a broad spectrum antibiotic to start treatment immediately while waiting on the result of the culture. If the culture ends up showing bacteria or other issues that need a different medication, they will then switch to the other meds.
Also make sure that any meds you get are to be injected, not given orally. That just doesn't work well with snakes unless its a medicine for internal parasites like worms or protozoans.
At this point its truly vital you get him to a vet fast. But it needs to be someone that routinely treats reptiles and has the specialized knowledge. I really cannot say that often enough..
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