Why do I sweat more than other people based on my level of fitness?Some people just sweat more.
I've worked with people who would have water in the tips of their latex gloves within a couple of minutes, their hands sweat so much.
Botox can be used to stop the excess sweating eg. in the underarm area, where it can be embarrassing to constantly be wet. You'll need to get shots quarterly, or so. And you may find you sweat more in other areas.
Some people elect for surgery
There are prescription antiperspirants that work for some people. Check with your doctor for more information.
EDIT: Saw this on a TLC TV show, What Have I Got. I can't find it on YouTube, maybe you'll have better luck. Season 1 Episode 3
SweatHelp.org - Gustatory Sweating