Depends what your definition of overactive sweat glands are. It's been noticed by others that I sweat alot at times, though. If I'm not doing anything of course I'm not going to sweat, but I seem to sweat easier and more than others. Like it just feels like it's hot and I start sweating, but others are just like "damn it's hot and icky" and they don't sweat really. Maybe they do but they don't sweat to the same extent.. like I'll get nasty pit stains or back stains sometimes, which is a piss-off. Sometimes it's worse than other times, but generally I think I sweat too much. I dont' know why .. I'm not overweight, I should actually gain some weight ..
the only thing I can think of is my heart. for some reason it ain't in good shape, although I get more exercise than your average american. I can't run for long compared to other people (out of breath faster?), and i took one of those quick heart rate tests where you just hold on to something, and it was surprisingly high .. I'm not sure how it's possible or if the thing malfunctioned, but my friend who was with me got a good rate. So that's kind of scary..
anyway, that does it for me.