What specifically have you tried for the yeast overgrowth? Have you tried to correct it in your digestive tract? Yeast overgrowth is a sign of imbalance in your body's biome...we all need candida, but a healthy body has enough balance to keep the candida to a healthy level. If it's out of control, it's feeding on what you're eating and/or is not being countered by enough other good bacteria.
Have you eliminated sugar and grain from your diet? Do you eat fermented foods and take probiotics?
Treating the yeast isn't an external exercise, it's about correcting your body's balance from the inside out. An elimination diet can take some time, but you should notice a difference in how you feel within the first few days and see dramatic results in a couple of weeks. If you haven't already tried this approach, I would check out the following websites:
mercola.com
theyeastconnection.com
thehormonecure.com
You can't just accept this as-is, it's a sign of poor health that needs to be corrected. Sugar and grain feed yeast and cause systemic health issues for some people. If you haven't already tried eliminating these from your diet, start with a good detox program and see if that starts to give you results.
Good luck!