Sorry, I’m reading backwards and just saw this post from you. I think I answered all that in my post before this. It’s not food, I know that. It’s not an allergy - I already take that super Benadryl every morning.
What you have sounds like what my mother has suffered from for many years. She would get tiny pin head blisters on her hands. They would itch and if she scratched them the liquid that came from them was clear. They itched so bad that she could not stand it. It would spread and her hands would crack and peel. It was bad... She learned that she was allergic to several things that she had never been allergic to in the past. One thing was she could no longer wear any metal on her skin... this included gold. They also felt that she continually suffered with some sort of inner yeast infection that would cause these breakouts. They never did find out exactly what was causing it. (they continued to eliminate things from her daily habits to see if they could figure out what was causing it) She still suffers from it from time to time. I know she has a under active thyroid and her outbreaks were really bad (like what you are going through right now) before they discovered she had a under active thyroid. She is on medicine for her thyroid problems and the breakouts are not as bad and they don’t happen as often now. It might be a good idea to see if your thyroid is working correctly. An under active thyroid (Hypothyroid) can cause rashes and hives. It is something to check out.
I feel for you because I know just how horrible it was for my mother. She could barely use her hands due to it.
Gold Bond makes a fairly decent anti-itch cream that may help give you some relief. Witch Hazel also might help but it might sting at first. If you try it... apply it to a small area first to see if it will sting or not.
Also this past Christmas I broke out in a horrible rash after taking a prescription drug that I had taken in the past on and off without any problems. I had not been on this drug for about 6 months. I was having some reoccurring pain this past Xmas that I could not get to ease up with heat therapy. So I went back on the prescription drug and broke out in a horrible rash from it. For some reason I had become allergic to it. It is possible that you are now having a reaction to a prescription drug that you had no problems with it the past.