I am self- diagnosed, but my symptoms are so much like yours. My itching is on my upper arms. It starts with a pinch, that feels like being stabbed, with a needle, then extreme itching starts, that is impossible not to scratch. No rash, ever, but the itching for hours. It does the go to the other arm, just as badly, but not as often.I do have a bad neck, and sleep, on a water pillow. Now, I don't feel like I'm crazy!!