I don't know that the seizures are a part of TOS/TOC - I haven't read anything about it on our TOS forum.
But the whiplash could have aggravated a few things - have you read anything about Upper Cervical chiropractic? also called c1/c2, atlas/axis - it is different than the usual DC adjustments.
www.upcspine.com is a good place to start learning about it.
signs/symptoms -
http://www.upcspine.com/self.htm