I've had terrible trouble with thrush and the only thing that got rid of it was a sugar and yeast free diet for 10 days and flooding my system with a good pro-biotic. I took twice the dosage as recommended on the bottle, advised by my chiro.
It kicked it right in the butt. I remember the horrible feeling of not even being able to walk properly The creams worked in a soothing way when first put on but they just couldn't clear it.