I have been suffering from the same thing for 3 years now. No doctor believes u. They think u r crazy. It's some kind of Fungus that attacks people with a weaken immune system ie a cold, diabetic. It got into something that you ate. U r lucky it has gotten into my scalp all over my body. I was looking at some information on the Web. Google Gu Syndrome. My name is David. Email when you get a chance.
They sound like nerve endings to me. Sometime stress can cause that sensation, but since you have had since a child, I doubt if that is the case.
I would suggest maybe seeing a chiropractor, if it is nerve endings, he/she can help with it and that sensation will be gone after the first treatment.