Couple of questions and a couple of answers: first, have you been to the doctor to make sure that it is a yeast infection? There are other infections that can have the same symptoms. And there are infections that cause yeast infections. Meaning, you can keep getting rid of the yeast infection, but the underlying infection can make it come back again and again. Second, if it is just a yeast infection there are a couple of things that you can do.
Things to not do, or use:
do not use colored or scented toilet paper or tampons
do not wear underwear with colored crotches
do not take baths, only showers
and you can get the prescription pill for yeast infections from your doctor if all else fails. For people who get these infections constantly the doctor will usually give you a couple of pills. That way, when you first start to feel the symptoms you can take the pill and stop it before it starts. I hope this helps.