Hi there. You are right about hypoglycemic seizures. The other neuroglycopenic manifestations of hypoglycemia may be abnormal mental state, anxiety, fatigue, confusion, paresthesiae etc.
Other non organic causes of seizure may be a febrile convulsion due to very high body temperature. He needs to be evaluated thoroughly for a complete blood sugar profile, fasting, post prandial and an hbA1C to check his glycemic control over the last 3 months. The neurologist should reexamine him for systemic manifestations of diabetes to check. Take care.
Thank you for your kind input.