Why would somebody get an electric shock-like feeling in their head?

Well it could be an electric pulse in your skull from the secret government mind control satellites in the sky; or you could have some problem, like tooth decay, which is making a nerve in your head very sensitive. If you are hearing voices telling you that everything will be fine as long as you conform and consume, then I suggest wearing a hat made of tin foil; otherwise, see your dentist or doctor.