Interesting, the baseball cap story. Because the cause of my ON (I think thats what it is) was due to me and a screen door colliding in some fashion. I hit it on the left side of my face right at the temple where the baseball cap lower part is. Had tingling and zapping for a while its lesser now due to the Neurontin. Feels like a spider was crawling around in side my scalp for a while there and like a sunburn all over my head, thats how I discribe it.
Some nites I sleep fine but some nights my head throbs. But seems like the tingling sensation is going away.