Keep some small juice boxes or cans handy wherever you are, and if he complains of headache, fatigue, or if he seems cold for no reason, you may want to offer some juice to bring sugar levels up. If I were you, I would ask to be referred to a
juvenile diabetes specialist, who can tell you first-hand that seizures can be caused by severe hypoglycemia. No, he does not sound like he is diabetic, but severe hypoglycemia can be just as scary for parents to deal with.