It'd make sense to go to a chiro, a whacked out spine can cause all sorts of strange things to happen to people. I used to work in a clinic before and patients would come in with problems like feeling perpetually cold in hot weather which would go away after a few adjustments. And seeing a neuro would be a good idea, the chiro would help get you some relief now but you'd definitely want to know if there was a neuro problem causing the itching. I hope you fet some relief somewhere soon, it sounds horrid.