I agree with Echoe's response to your latest post.

It's good that all of the tests came back normal. Your description does sound like a tonic-clonic ("grand mal") seizure. Allergies can cause them, as can many different medications. If those things have been ruled out, I'd recommend getting a VEEG. EEG's aren't always picking up a good line of activity in the brain. A video recorded EEG, usually lasting an hour or so, so they can see your brain activity in sleep, wakefulness, light stress, and being "normal".

For future reference, a small pillow under your head. Loosen tight neck gear (buttons, collar). You don't want to be held down ~ someone could get seriously hurt. People can help by easing your body down into laying position (on your back), that's helpful in avoiding injury. I'd also recommend someone staying with you until you've become fully conscious and have regained strength.

Best wishes to you ~ hope that you get answers & treatment very soon. Please do see a neurologist or epileptologist to find the answers.