RI as in respiratory infection?
I just got back from taking him to the dealer's. They looked him over and the best they can come up with is it might be because he hasn't defecated in a while and then gave me contact information for a vet nearby that treats reptiles. Considering I just cleaned his enclosure last night and didn't find ANY excrement of any kind, it could potentially be that and I hope that's all it is over something a lot more serious. By the sounds of it and the puffiness of his lower section, especially when you stroke it, it feels and sounds like there's air trapped in there?
At any rate they told me to give him a warm soak, which I have. I'll be periodically giving him warm soaks through-out the day and then if there's no change by tomorrow, I'm making an appointment with the vet, although I don't believe they have anything open until Monday, but hopefully this won't be a worst case scenario.