Yeast infections

I have been plagued with yeast infections for the past year or so. My partner and I have outstanding by the book hygiene. I've had my sugars checked and I don't have diabetes. I've had every test ran they can to do to eliminate other possibilities of the discharge. So I know it is yeast. I can get rid of it for a few weeks with the prescription pill and cream, but then it comes back. Anyone else have this or a similar issue?