Secretion of insulin and other islet hormones are influenced by the hypothalamus and other brain areas. Also, insulin action in the hypothalamus influences both energy balance and glucose metabolism. I would question where the epileptic activity is happening in the brain- is it close to or involving the hypothalamus? It sounds like you are having reactive hypoglycaemia if levels are low following meals, as opposed to non reactive hypoglycaemia. I don’t know the answer to any of these questions, but I do know that epilepsy seems very closely tied to wacky hormonal stuff. It seems odd to me that it’s been around as long as brains but we still understand so very little.