During the early hours of this morning, my cat (who's about 8 years old) woke me up on three separate occasions. Every time she appeared to be "fitting", almost like an epileptic seizure? Her eyes were flickering and she was gasping. It lasted a few minutes. I've never her seen her do that before and she looked worried. It's completely different behaviour to when a cat wretches and convulses as it tries to vomit. Any thoughts on what could be wrong?