I have precisely these symptoms (severe itch, no rash) and definitely worse at night. Noticed first on my upper arms though - and was going through menopause so just assumed it was due to hot flashes. Twenty years later it is clearly along the brachioradial pathway and recent x-rays and treatments reveal a lot of issues going on at the C-4 to C-6 vertebrae. But I had not put this neck condition together with UV exposure. Now living in FL it makes absolute sense to me that this is the condition. Grateful to all the postings of things folks have tried. Ice gives immediate relief but is obviously not practical as a cure. I just had a hip replaced and noticed the itch disappeared- perhaps due to the medication but I suspect it had a lot to do with the level of relaxation my muscles finally received - and the hydration of fluids - and the lack of uv light I was exposed in the first 2 weeks of recovery. Now 12 weeks out it's back with a vengeance - and intense sun here in Florida. So I will be following up now to explore treatments and really appreciate any studies people can share to help inform my practitioners of this condition that clearly many people suffer in silence with. Oh - to get back those years of just enduring it! The "OMT" treatments are my first choice (gentle manipulation by a DO practitioner) as I have not found a chiropractor I trust here, and with osteoporosis now too I want to go the gentle route. I have been for over a year now learning to recognize "nerve pain" and damage - and there are many very gentle methods for nurturing the nerve fibers and restoring blood flow and relaxing them. Will post again when I find something that directly correlates to improvement. Cheers to all those who found relief!!!! There is hope!