PLEASE take him to the vet for a proper diagnosis, and like others have said regardless of diagnosis, euthanization is NOT the only option!!!

That is just one of many problems that could be wrong with your little kitty, the only sure-fire way to know what is wrong is a trip to the vet.

Good luck!

EDIT: Read he's booked for a vet visit on Monday... keep us updated!!!

Also... odd it says you have 0 posts!