I have seizures. The first thing I want to say is that it is harder for the person watching than the person having it. Really it is. I have them in my sleep, if I forget my meds, and when I wake up DH will say that I had a seizure and my response is always, "I did?" So, while you are understandably freaked out, know that your child isn't hurting.
Hang in there and feel free if you have want to talk.....