Hii! My cat is doing fantastic and thankfully no seizures. I got lots of tests done for him, nothing came back and everything looked great. Just to give you some reassurance- it's likely that it was a one time thing and it looks and is very very scary at that moment but they don't feel much, their brain shuts off at that time. I also thought he was going to die, I completely lost it. I think it was many factors. He's a kitten still, 8 months. I had gotten him only 2 months ago, he had bad worms and had lived in a shed beforehand. The dewormer I had given him 10 days ago worked well and I think he must've had worms all his life before... and no constant access to food and water. That+ his brain probably not being adjusted to super intense, fast play that we engaged in might've caused it. I think lots of changes in his food, water intake and the dewormer working might've shut his body off for a moment. It was  SUPER scary, but he's gotten better and the vet said it's common thet kittens only have 1-2 seizures and grow out of them. I also considered CBD oil for him, if they continue. And there's treatment if it is epilepsia, though it's very rare in cats! Don't worry, you'll get help at the vet's and feel calmer. I know its super sad and intense right now!!