Help! Any ideas?

So, whatever is going on started off like a yeast infection. I thought that's what it was, and I usually treat them using gentian violet. It's been a week now, and my symptoms are: red swollen inner labia, burning feeling, lots of white watery discharge. There is no longer any itchiness like when it started, it just hurts. I don't have any insurance, and can't pay to go to the ob at the moment.

Also, I have been with the same sexual partner for 6 years, and I know for a fact that there's no cheating going on. We have both been tested for STDs before, so that's not it.