I thought I read one time that it could be sexually transmitted and that both partners may need to be treated. I can't remember where I read that though. You might try some different probiotics to help restore the good bacteria. I have tried several and could not tell a big difference between them, but my mil really likes ThreeLac. I have used it too. Kind of expensive, but is supposed to be very powerful and good for Candida.
http://www.candidafree.net/pages/1/index.htm