I also had/have recurrent vaginal bacterial infections... I think once they appear, they're really hard to get rid off. I took so many courses of antibiotics. During my first pregnancy, I was miserable because I had bad nausea and the antibiotics made it worse. For my second pregnancy, I got Group B strep, which is more dangerous. I found a gynac who supported my decision to take no antibiotics except during labour whee it would be administered intravenously. I also told the public hospital docs where i had some check-ups that I refused to take antibiotics as the infection just kept coming back. They agreed and that's what I did and I was fine.
Bacterial infections are the worst... yeast infections are easier to treat, even if natural remedies. One of my friends who used to get recurrent yeast infections found out she was allergic to some foods and when she avoided those the infections stayed away.
Anyway, not sure if I was any help because I dont know any gynac that goes beyond the antibiotics routine. I plan to look into some alternative treatments now that I'm no longer pregnant. But let me know if you find a doctor that's good with this sort of thing.