Picard,
Having been the victim of panic attacks in the past, I can tell you that once you recognize it coming, you can control it with your mind and finally get to the point that they finally go away.
I don't associate seizures with panic attacks but I am no physician. You didn't mention that you think you are going to die during such an attack but that is one the symptoms. Read the following from Mayo Clinic and it should lead you in the right direction to overcome your problem. Good luck. It ain't as bad as it seems, believe me, but it does scare the hell out of you if you never had one before. <img src="/images/graemlins/shocked.gif" alt="" />

http://www.mayoclinic.com/invoke.cfm?id=DS00338

I believe I would consult a doctor if seizures are involved. It sounds like something more than a panic attack. Just my opinion mind you. Speaking from experience and witnessing some others and talking with them. <img src="/images/graemlins/smile.gif" alt="" /> <img src="/images/graemlins/smile.gif" alt="" />