Nystatin by itself (oral and enemas) worked for about a week, but then I had a relapse with a different, stronger type of yeast.
The one I had before the Nystatin, that the Nystatin killed off, on my tongue was white. The yeast that took over after that was dark brown. After a little research online I believe it was a very strong strain of Candida glabrata (glabrata varies from white to dark brown depending on how virulent it is).
Once I added lactulose and resumed with probiotics I broke through the dead end I had reached with the Nystatin.