How do you deal with excess sweat?

I used to be a "normal" sweater that was easily dealt with by wearing a basic deodorant. But the last few years I've been cursed with a ton of excess sweating and it's bothering me. I'm a very hygienic person, I shower daily and wear deodorant and the like, but my *ahem* down there area seems to attract the most sweat. It's gotten to the point that I carry fresh pairs of undies in my purse and change them multiple times a day or I just go commando when I'm home and have no plans. How do you keep your vaginal/armpit/any sort of body sweat under control?