Hi, I wonder if you could have yeast plus gardnerella. From the forum I joined on Yahoo, I have read many posts of ladies who have both, and the yeast keeps the smell away. In fact, I think I had both at the same time, also. There's a yeast diet - no Sugar or refined carbs, which can help with BV, also.
A lot of doctors aren't trained to spot candida (yeast).
I hope you feel better soon. I know, the itching can be maddening.