Chronic yeast infections?

I'm 20 years old and I get yeast infections CONSTANTLY. Anyone else out there have this problem? Are there any ways to help clear up the symptoms until I can get medicine? And how do I prevent them from happening again? I'm a very clean person and do clean down there, I only wear cotton underwear and I dry off quickly after swimming. I've tried to talk to my doctor but he usually just says its normal and prescribes my medicine