1. I get that, too. I usually just dry myself off once or twice a day with some toilet paper, because that can start to smell like regular sweat does, but otherwise it's not a big deal. Have no idea how to prevent it, though (it seems to be a lot better when I don't wear underwear, but I'm not sure how much that helps you).

3. The nipples or the areola? Because I get little bumps all over my areola when I'm cold/aroused and I never thought anything of it - they're just sort of goosebumps.