You might consider seeing an immunologist. It was determined my T Cells have for whatever reason are elevated due to - pick anyone one: history of eczema , flu vaccines, lime disease, noro virus, COVID 19 (severe), 4 covid vaccines and 2 Shangrix vaccines.
I understand this itch and it is maddening and debilitating. I have it on my scalp and on my left arm only at this time. I will say at this time I am definitely finding relief most days thankfully: GLUTEN FREE DIET Cold packs and where I can place them, dermatologist ordered a compounding creme of lidocaine and trimphylete- messy for the scalp, buy hey when you itch it’s worth it. 5 months of weekly sessions of accupuncture, Started supplements recommended by both the immunologist and a functional medicine dr: Vitamin C with zinc, vitamin C only, Biotin, Folic acid ( blood test showed defiencicy in Folic - this can affect the nervous system), Magnesium, Vitamin D with K ( they say the K part is essential - who knew?) and Calcium strain got only. SHAMPOO: Capsaicin shampoo from Amazon and CAPSAICIN spray for itch is AMAZING - both can be purchased from Amazon. This has became a marathon and while it’s not clear what caused my severe neuropathic itching it’s also not specially clear what is helping - I am doing ALL of the above and I am definelty getting RELEIF. I wish you well and I really do feel for you.