not too long ago my cat was also acting funny. he had like two seizures in a week and he's old so i didnt know what it was exactly.
i went on this site: http://www.JustAnswer.com. they usually have vets that can answer the question. i described what happened on there and got a response in about 30 minutes. it turns out, he did have seizures and if it did happen once more, we had to take him to the vet. but since he was acting normal after the seizures, he was fine for a bit. he hasnt had any since then.