I've had Bacterial Vaginosis for almost 3 years?

I have went to the OBGYN and received over 20 prescriptions within the past 3 years. Within the past 4 months I had received 4 prescriptions including the gel and the oral pills. I stopped using tampons, I changed to cotton underwear, I stopped wearing thongs, I eat yogurt everyday, I wipe from front to back, I stopped having sex for 3 months, I cut down on sugar, I take 2 showers a day, I dont douche, I take garlic pills everyday, I drink cranberry juice everyday and I even took the pro fresh supplements for 30 days. As you can see, I have tried all of the prescriptions and at home remedies. I am worn out and this will not go away. Help Please....