http://www.anapsid.org/vets/index.html#vetlist


http://www.arav.org/Directory.htm

There's a couple of links that should help you find a vet.

Could the snake be getting ready to shed? Sometimes a bit of dry skin will get in the nasal passage and cause a weird sound when they breathe. But if its happening when it hisses, I'm not sure. Could be an RI (Respiritory Infection). I would suspect that before I would suspect IBD.

As for the not eating...there could be a lot of reasons for it not eating. The first step would be to determine if its environment is set up just right. So if you want to describe your setup, we might be able to help you find clues as to why its not eating.

But a trip to the vet is the first order of the day. It could also be internal parasites that have suppressed the little guy's appetite. So be sure to ask about that as well as the weird sounds.