I came to this forum right now for more thrush info -- I already feel like I have enough for a degree in thrush!!
One thing I know for sure is that nystatin is a terrible medicine, which is really not helpful at all, especially becuase it does contain sugar! The only thing that keeps thrush at bay for us is Dr. Newman's Nipple Cream
. It is a miracle. Scroll down the page for the recipe to give to your doctor (it is a compunded prescription). You have to get it at a compounding pharmacy, and it may take a couple of days for them to make it up. It is so so so so so worth it.
Good luck with the thrush. It is awful!