Hi there ~
I understand your concerns. It seems like you were involved in high risk sexual activity and that you had unprotected sex and later on went on to have a yeast infection. I believe that you need to maintain good sexual and genital hygiene and that you will need to consult a sexologist
or a qualified doctor who can help take a good history and do a physical examination before you can get treatment for the infection. I hope this helps.
Take care and have a lovely day!