Im tired if going to the GYN with no solution and no one seems to take me serious!

I keep getting yeast infections after i have sex with my bf. The thing is he is circumcised so I'm not sure if he could still be carrying yeast without any symptoms?? I'm not on birth control and he doesn't finish inside me so its not his sperm either. Im just going crazy i wish i could have a normal sex life. Im going to start taking probiotics again and going to start taking vitamins hoping this can be a solution i would love to hear if any of u have any suggestions