What Causes Creepy Crawly Skin Syndrome In Scalp And Back?

I have a creepy crawly feeling on my skin especially on my scalp. It itches so bad I can hardly stand it. When Weather changes like rain, fog, frost, snow, or just cloudy weather, when night falls, feels like something crawling in my ears and in my eyelashes. Sometimes it feels like something biting me. My back itches bad too. There are no rashes. I can t see anything with the naked eye or a magnifying glass. I have been to doctors and they seem to not care. I want to know where there is a lab in Tennessee that can possibly help. I also know there are many people all over the internet that has the same problem. Thanks Kerry