Re: "buttered biscuits' smell
I'll second taking the 7 day vaginal insert medication, but along with that, try taking active culture pills (similar to what is in yogurt) along with eating yogurt. I just posted this in answer to a different question, but it works here too: The things you want to look for in yogurt are active cultures, the more varieties in one yogurt the better. In pill form, you look for acidophillus, bulgaricus and bifidum (or bifudous) strains. The pills are rather expensive (if you can find one with all three, it's about 35 bucks for a month worth), but they bring your body back into balance really quickly, along with daily servings of yogurt.
If you kill off everything in your uterus with the medication to treat the yeast, the balance is all wrong in your system, and taking the cultures in pill form will help balance it back out. I was having recurrent yeast for 5 months, giving me that same smell, but it was also very atypical in that it never itched like yeast or looked like yeast. But every time I went in, it was yeast under a microscope.
Over the course of 5 months, my doc had me take the one day pill, nothing. Then the three day vaginal treatment, nothing. Then finally the seven day, nothing. After a month, I tried the seven day treatment again (with my gyn's approval), and took the pills and ate yogurt during and after the treatment. I've been fine ever since.
Your mileage may totally vary. But I thought it was worth a shot.