Yes, I have heard of it. I wonder if they could tell from the culture that the boric acid would be effective; did your doctor mention whether they tested for its effectiveness against the type of yeast you have? They even sell tea tree oil suppositories at health food stores for treating yeast, but I would not use them without a doctor's okay. Take plenty of acidophilus (also from a health food store. 4 billion live bacteria per day is the suggested dose) while doing these treatments, and really try to minimize the sugars you eat (including fruit juice, white flour, and refined sugars.) Good luck to you!