I'm going through something similar. I've had recurrent/persistent BV and yeast (sometimes simultaneously) for the last 4 years or so. It's been scary, frustrating, and difficult. I've never had a doctor who's been willing to work with this, and last week was the first time any tests have been ordered for underlying causes-- they're still at the lab, so I'm trying to enjoy the week and not be nervous, but still.
I also suspect I may have had a bout of oral thrush, which seems to have cleared up with the 3rd Diflucan in as many weeks. However, I'm not entirely sure it was thrush, and no one took a culture. It could easily have been allergies/sulfuric compounds built up, so I'm not sure what to make of it.
Nothing's really helped. I'm on day 4 of Terazol-7, and while it does a bit to stave off the itching during the day, I think the cream irritates the vulvar area.
If this doesn't work, I'm at my wit's end. I also take L. Reuteri every day, and I'll believe that it can do its part to maintain a healthy body, but concur that it does nothing to clear up an infection, at least not in the doses I take.