Last night I noticed that my chinchilla was acting odd it was like a hiccup and then he would bark almost like it hurt him. Also he would not come to me and was acting very lethargic. It lasted for about 30 mins then he stopped I checked on him through out the night and before I left for work and he was acting fine. could there be something wrong with him? I have not changed his diet I only give him chinchilla food and treats.