I dunno, but I'm of the firm belief that if you have the slightest worry your snake might be sick, a trip to the vet is definitely in order. You know your pet and how he behaves. But, as has been said here, ANY nose a snake makes when he's breathing is NOT a good omen. By waiting to seek medical care, you are only making the situation worse. Your snake may indded want to eat, but his health my be prohibiting from him to do so.
Just some food for thought, so to speak.