Niacin deficiency can cause Neurological problems too, so lets just keep hoping this is what it is, remember to get plain niacin. Is he eating and drinking okay?I was sitting with Gus and he appeared to have a seizure. His eyes kind of glazed over and he lurched forward and his head and neck went limp..I thought he was dead and after a few seconds he came to. Is this consistent with the Niacin deficiency or something else?