yeast infection.. help!

I keep getting yeast infections. I get them before & after my period. The first time I had gotten a yeast infection was back in November. I was prescribed medication. The infection temporarily stopped but then it came back two- three months later. Yes, I'm sexually active. I only have one partner, my boyfriend. This infection blows away the sex because I've been wanting oral from him but no way in hell is that happening with this crazy infection going on! What are some good things to stop yeast infections? Help a girl out 😩