advice please

I've tried everything all meds, creams, gels and even oral pills. 
I have vitamins and tried yogurt but nothing works!
I seem to stay with a yeast infection and it's quite annoying 😒, imagine your vag always irritated after anything 🤦🏽‍♀️. 
I literally had sex like 20 minutes ago and immediately showered, I now have a yeast infection. 
Ladies what are your remedies I'm desperate 😔