Really itchy feet, won't stop?

my feet have been itching for hours. Its not in between the toes, its the bottoms of my feet and the tops of my feet along with the tops of my toes. It's an extremely annoying sensation and I can't get it to stop, I used an anti-itch cream, but that did nothing, it's down to the point when it hurts to scratch. I tried just to refrain from scratching, but I find myself scratching in my sleep without voluntarily doing so. Please tell me what I have to do to stop this itching!