I have a 3 yr old cat that I got from some one who knew someone... Anyway, I've had him for several months now. He is a sweet guy. Tonight, for no apparent reason, he went into a terrible seisure. It took him quite awhile to "come out of it" and when he did he was so embarrassed at having wet himself he wouldn't face any one. My question is... "What would/could cause seisures in an otherwise healthy cat?"