My friend said she she used yogurt too, but not in the traditional manner. She used plain, no sugar (yeast loves sugar, so that would be a terrible outcome), Greek yogurt on put it "down there." Now, do some research on homeopathic and home-remedy treatments for yeast infections, especially regarding the yogurt, before you try this, but it may help.
And like they said, avoid harsh soaps and sex for a bit.