Suggest Remedy For Foul Smell From Vagina After Periods

Hi for the last 4 months after my period my vagina starts to smell horrible like fart and I don't know what's going on, I tried sticking garlic cloves up my vagina also putting peroxide inside it but that works only for a few hours please help me my boyfriend doesn't even want to have sex with my anymore because of the smell. I'm so embarrassed please please help .