Scenario: There is a family, in which father is no longer present and hasn't been since shortly before the birth of the youngest child, ten years ago. Mom has Munchausen Syndrome by Proxy (MSbP), and perpetrates on the youngest child; the middle children (a fraternal twin set), due to the attention given to their younger sibling--and the attention garner from the MSbP before their brother was born and while he was still very young; before they hit puberty--have begun to develop Hypochondriasis; the boy has been diagnosed and is being treated, but still displays a preoccupation under stress. The eldest child, Nico, is actually ill.
During one of their stints at the hospital, Nico gets into a fight with his mom. He's been having aura symptoms all day, particularly having inappropriate outbursts (which, of course, Nico's mother doesn't appreciate). Most of the doctors at the hospital don't think much of Nico behaving like this, because his family is ~*~crazy~*~. When he goes down to the cafeteria to get something to drink, he slips out of the aura--and then goes into a tonic-clonic seizure, which nobody responds to for a minute because his family is ~*~crazy~*~ and they think he just wants the attention (a guy who doesn't know him finally gets that he's having a seizure and drags one of the nurses over to, uh, do whatever it is you do with seizing people? I can figure that out later).
Question: I know that tonic-clonic seizures--that any seizure, really--can be induced due to elevated stress levels, hormonal imbalances, fatigue, and things of that sort. I also know that tonic-clonic seizures are (classically) a symptom of Epilepsy. Wikipedia offered some other epileptic and generalized seizure conditions, but none of them really seem to fit Nico's situation. Are there any other diseases/conditions that produce tonic-clonic seizures that may not have developed until this sudden onset?