Neffie has seizures. I never knew that until one day we were playing and when she stopped, she started to convulse. Luckily I am epileptic and knew what was happening even though I am never aware of my seizures.
She's had 5 total since we've had her(about 3 years now) and everytime I talk to the doctor about her he says she's ok(did complete workup each time) and if I want, he'll put her on meds, but I never opted for that because her seizures are so few and far between. I just watch her and if she's having one, I shield her from the other cats, and talk softly to her until she comes out of it.
It only last less then a minute but enough time for the others to think she's playing.. When she's done having it, she gets up and walks off like nothing happened.
My advice, talk to your doctor and see what they have to say about it. It might be a once in a lifetime thing, or it may have happened for a reason.