it can take a while for them to pass anything so dont worry about that. they dont go very often. its not like one rat in and one rat out. if u fed a rat that is larger than necessary it could take 3 or more days for it to digest to a safe handling size. the noizes u hear are either shed stuck in its nose like they said or it could be an RI starting. ive never had any noises coming from my snakes because of the food they ate. it doesnt make sense. if ur snake had a good shed last time and isnt getting ready to shed again then it is prolly the start of an RI and u need to get ur vet to get it checked out.