I too, suffer from this sweaty palm curse...
I used to be 'normal' all my life until someday a very traumatic incident happenned to me and then this symptoms started seemingly out of nowhere...
I have sweaty palms sometimes without any stressful stimulus present, sometimes it is a daily thing, it comes and goes... I have tried looking up 'hyperhydrosis' and the Googled 'sweaty palms' but no help, only some very expensive operation to sever the nerve responsible for sweat to the palms and soles of the feet (so that they never sweat again) but I think that is too much, I want to live a normal life without surgery!
I am 28, unemployed and have given up on ever finding a job as everytime I go for interviews I sweat profusely and hence they don't call again... I feel awful as well in front of new stressful situations and wish I could get rid of this freak disease which has robbed me of the joy of life and stolen many years of my life...