I have cured my armpit excessive sweating that i've had for 2 years (I am 27).
I've made a 10 days water fasting, after the 8th day, the hyperhidrosis stopped, so from this moment I realise I could cure it. when I have started again to eat, smoke, drink and having stress it came again...
What I did?
I do a lot of sport, but I did more, and more, everyday, a lot, running swimming bike everything i could do, one day, it stopped (reduced almost 85%)
I am sure that there is something that my body try to get rid of, and it does sweating. Even if it's worst when i am nervous (a lot of worse) i don't think stress or anxiety are the main source of that condition(who is not stressed???)
Well please if you have any questions if I can help you i'm going to do it because i know how hard is that.