Well I had that problem once, but I picked up a $1 back scratcher from the store and ery'thing's cool 
My back is the worst! When I'm sitting at my desk at work, I use a ruler, lol. When I was young I used to get an itch inside of my ear where I couldn't reach it with my finger. I started trying to stick stuff in there, pour water... that right there is enough to drive you all the way INSANE.
I know some other ladies besides me know about that night-before-relaxer scalp itch. If you scratch it, it's gonna burn when they put the relaxer on, so you sit there trying to "pat" it away, lol.