By the way, an overdose of insulin depletes potassium, and guess what? Ocasionally causes a siezure.
I would find a new neurologist. It is highly unlikely, but clearly the sodium- potassium flux generates the electrical potential for nerve conduction, so low potassium will decrease the threshold of susceptability to a siezure. Low potassium makes the electrical system "twitchy". There is probably a co-factor involved. It is pointless to "seek studies". Don't get into an intellectual battle with this guy. He clearly is not that sharp a tack. Just keep your potassium levels within normal limits.