Zosimos below is right. And never douche (as mntioned above), it will throw your bacteria even more out of whackand may worsen the infection as your body will go on overdrive to replenish the yeast that your body needs. There are a bunch of strains of yeast and bacteria in water kefir, and it appears your body just doesn't like one of them. But there are also many different kinds of water kefir - not all are pure tibicos. You can try some from multiple sources, or - Trust your body and if there's a reaction, then get your bacteria from a different source :).