You may have had yeast, but the single-dose pill (fluconazole in all likelihood) would have killed any yeast you had. What you have now is most likely residual irritation/eczema left over from the infection, not the infection itself. That, I think, is why the yeast/fungus cream you're using now isn't helping. I suggest you try over-the-counter 1% hydrocortisone twice a day for a week. If that doesn't help, ask your doctor to have another look.
Take care.
Dr. Rockoff