Let me just tell you that prayers have been answered - I use apple cider vinegar for many small things, but I didn't know it would work SO AMAZINGLY for yeast infections. Please, anyone who gets yeasties or vaginitis, have a look at this site. And if you don't get them, check it out anyway because it's wonderful information to have on hand! Scroll down a bit on the page until you reach the section titled Apple Cider Vinegar.
Enjoy! Happy period!