@ElizaBennett - I tried that! Of course, I was trying so many other things (like an ovulation predictor kit) that I have no idea whether or not it was the Robitussin that did the trick.
I think that before I got educated, I probably treated myself for two or three "infections" that were really just my normal, healthy white, thick vaginal discharge during ovulation. I didn't keep track of my cycles particularly and didn't know that it was normal to have more discharge at some times of the month, so I would get alarmed. And maybe there was hot weather so I had some itching, and thought that the two together meant infection.
Some time after I got educated, I developed a *real* vaginal infection. There was no mistaking it; there was definitely an off-odor. But I went ahead and saw my doctor to make sure whether it was yeast or bacteria.