Thanks Sprawling,
I bought the Ionmat Iontophoresis machine (
https://www.ionomat.com/en/)
After 5 treatments (with 2-day frequency), I got very good result. Then I kept the frequency of 3-4 days/treatment and the efficiency last for 1.5 months.
Then the efficiency reduced.
I then increased the frequency to 2 days/treatment and the efficiency returned.
But it last for about 2 weeks, then reduced again (although I still kept the 2-day frequency).
Now I'm still keeping this 2-day frequency, but my hands are still wet (not very wet as before using this machine, but far from the initially-good result).
Actually I don't have any anxiety, medication, or living place changing; I used only one tap water source (for about 2 weeks until now I used Lavie bottled mineral water instead, with some added baking soda).
But no progress.
Please kindly advice me what to do, because I'm so sad. And I understand that you have much experience in this.
Thanks a lot and best regards.