NSFW: What are the chances one round of antibiotics isn't enough?

Asked by livelaughlove21 (15724) November 29th, 2012 from iPhone

I was given a seven-day Doxycycline prescription for a vaginal infection. I still had some symptoms afterward, so I saw my gynecologist for a follow-up. He said that everything looked normal and there was no sign of an infection, but he didn’t swab me to be sure. I’ve been having unexplained symptoms for awhile, so he advised me to leave it alone and see if my body takes care of it on its own. This may sound weird, but I’ve asked a couple questions about this and, let’s just say it’s a long story and after 3 doctors and many medications, it’s a mystery.

Three weeks later, the same symptoms seem to still be there and worsening: itching, rawness, thin white odorless discharge (NOT a yeast infection; just got through a round of Diflucan). I’m just wondering what the chances are that one round of Doxy didn’t quite kill the infection? My doctor seems to think not, and said not many things are resistant to Doxy, but if the infection was there for a long time before treatment, maybe a ten- or fourteen-day prescription was needed. Plus, it said to not take it with food, but I had to in order to not get sick, so maybe that affected the absorption..?

If that’s unlikely, what types of things can cause recurrent vaginal infections? I’m worried it could be something non-GYN related that is causing it, but I’m not sure what that could be.

I’m seeing a doctor next week, but I just want some input beforehand so I know what to ask him or maybe mention to him.