Yes I have had this over the years and have it right now since about 5pm, not able to sleep yet with the zap happening.VERY painful for about 4 – 8 seconds. I have been informed that there is a very slight swelling in the ear canal and the nerves at the side of the head run very closely to the nerves of the ear so it triggers off a synapse which is very painful. I found i get it if the windows are open in the car, i can’t have a breeze blowing at my ears or it happens like clock work. This morning i got splashed in the swimming pool into the ear, and then drove 1/2 hr to apt with windows open , it was a beautiful day free from smoke from the forest fires and i forgot so now i pay the price. I usually have a pair of ear puffs from the sporting goods store for skiing that i wear when the wind it up and i wear them, don’t care if it looks silly in summer but my hair covers them up. Better that than the horrid pain. I currently have taken a Tylenol #2, 5 mg of Oxycontin and 15 mg of oxazipam and i put an ice pack in the towel at the side of the head to numb the spot. The spot is about 2 1/2 inches above the ear on the scalp this time. Hope it simmers down asap, i need sleep.
I am a retired nurse. You have to pay attention to what you were doing within about 5 hours before onset of the zapping to know what is setting it off. good luck, always wear hats in cold weather.