Have you ever tried the candida diet? My husband has the white tongue and many other health problems (though not acne, that's me) and has been on the candida diet for about a year. The yeast is finally starting to die and his tongue is improving. Basically the only difference between your diet and the candida diet is for the candida diet you can't eat any yeast (which would be in bread, even sprouted) as well as no sugars, vinegars, or fruits (which all feed the yeast). I don't know if that will help you, but for what it's worth... good luck!