Thank you for responding :) we kept an eye on him all night and this morning he's completely back to normal. Can't explain it. Must've eaten a bug he shouldn't have maybe.
My energetic cat who is always begging for food is acting lethargic, refusing to eat, and has thrown up twice, just food and a little hairball. His third eyelid showing the tiniest but but usually they're never visible. He's resting now and he seems to be breathing a little deeper and faster...
