hypoglycemic seizure vs seizure disorder

My 23 year old son has been a diabetic, type one since he was nine..He suffers seizures with low bloodsugar.  He had another one this morning....it had been quite a while.  My question is how come the accucheck  reads above 100 when the medics get to the scene.  The ER doc thinks he has seizures, I tend to believe that his liver releases emergency glucose during the seizure to increase his bloodsugar.  How does one know?  He di have an EEG some time ago, which was normal.  He is so afraid that he may be an epileptic.  Any information will be greatly appreciated
Sincerely,
Ladybugrn58