Long time poster on this thread; and for the last 60 days, I have been ITCH-FREE!!! Even without taking Beta Alanine (BA).
Unfortunately, I've done three things that might have affected the outcome and from my personal feelings of least effective to most effective, they are:
1. I severely cut back on alcohol. Mentioning it only because it was happening at the same time. I really dont think this was a cause of loosing the itch and after this weekend of concerts and entertaining, still don't believe it to be a primary cause.

2. I treated the Actin Keratosis AKs on my arms and legs with a combination of Trenointin & Florouracil at the same time. The trenointin really roughs up the skin on arms and legs to allow the florouracil to penetrate and work as needed. **(I will caution you to not treat your upper and lower arms at the same time and always put on a sun sleeve or bandage below the elbow to keep the skin from sticking to itself while you are sleeping. )

3. What I think did the most good.
I started on 10mg / day dose of Paroxetine.
Paroxetine is a anti depressant but at this dose not strong enough to notice any changes in behavior or thinking. I noticed the reduction in the Aquagenic Puritius itching after 4-5 days and after 10 days, I could take a hot shower, then towel dry immediately afterward; something I haven't done in years. Also used a hot tub for the first time in years.

So I continue to travel with BA on me at all times, but haven't needed it since starting on the Paroxetine. I have stopped treating the AKs, and will update this post in 2 weeks, once the arms and legs have fully healed.

The list of Meds I have tried to date:
Paroxetine - Jury is in deliberation on this one but I think this is it
Beta Alanine - Proven to work, you need to take it 20 minutes prior to needing it
Gabapentin - didn't work for me, and the brain fog was something horrible
Dupixent -didn't work for me but I was on it for only 6 months and apparently it can take 12 months
? some salt based med, that gave me a headache worse than the Korean Soju hangover I had in 1994

Best of luck to everyone
I'll update in 2 weeks