my 8 year old cat, who loves to eat and loves his treats is acting strange. His eyes are dilated, he acts as if he is "seeing things". He threw up his food today and has been "dry heaving" this evening. I opened his mouth, and do not see anything, felt his abdomen and he doesn't act tender. When giving him a small kitty treat (he usually inhales it), he broke a piece in half and barely ate the other half. When offered food, he just stares (not normal for him). No history of any health issues