You took 2g of Flagyl for how long? I had heard treatment for BV took a week or ten days. Do you mean you took 2g daily for that amount of time?
It could still be yeast, but it's not for sure... The reason why I say that is because I was a little swolled as well and I burned, a day before that I was extremely itchy, I went to an urgency care to find out what it was, they found nothing!!! Guess what, two days later I found the yeast inbetween my labia minora and labia majora. And it was confirmed with my dr that it was yeast.