Welcome to the site!
It is very possible that your snake has an upper respiratory infection. RI's need to be taken seriously. When you get him to the vet make sure that the vet does a culture to determine the cause so the proper medication can be prescribed. Until you can get him to the vet bump up his cage temps.
Can you give us some details on how you keep your snake?
Cage type/size
Heat source(s)
Thermometers/hygrometers
thermostats?
substrate/substrate layer thickness
A picture of the cage would be helpful. This thread show how to post pictures: http://ball-pythons.net/forums/showt...with-pictures)
Here are 2 great threads to help make sure that you have everything right:
Care: http://ball-pythons.net/forums/showt...ius)-Caresheet
Cage Heating: http://ball-pythons.net/forums/showt...t-Thermometers
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