By how you wrote, you sound young. I am sorry you are going trough this ordeal, my dear. My recommendation is to see at least two or three other gynocologists. Push for answers. To relieve itching, especially at night, try putting plain yogurt. I use Mountain High. Just put a small amount, and put on a light day mini pad.
Next, stop having sex with men you are not married to. People don't ask about sexual history, and if people answers, they don't tell the truth, anyway. There is a price to pay for having sex with 'guys' when you don't know their family history and how many and, more importantly, they have had sex with. Just pick a good man and marry him. First, both be checked out and both be honest about your past immoral behavior. Then, you don't have to worry about these things. Or, if you don't find a guy, just don't have sex until you do. It could be years, but it's not the end of the world, and you have peace of mind and no itchy superbugs on your private parts.
I used to be very sexually active and have many partners (maybe 30 or so) in my life. I learned that that is now how we are wired. A woman has an open reproductive system, and a man has a closed one. Women are more vulnerable to all kinds of things. Please take care of yourself physically, emotionally, and spiritually.
Not sure if you are a Christian or Catholic, but you might be interested to know that the Bible reads that fornication is an abomination. In sex without marriage, the women loses big time.
Hope you get better.