Serious Question!!!

Sooo I’ve been having a lot of burning and itching going on lately . I’ve been to the doctor several times. The first time I went i found out that it was bacterial vaginitis, the second time I went, I found out it was a uti, and While I was there, I was checked for any std’s. My tests came back negative so I know that’s out the question. I’m also prediabetic (which I know has something to do with getting frequent yeast infections) but I’ve been working on getting my diet in order and working out for the past two weeks. I don’t know what’s going on... could someone tell me what’s the problem or what they think it may be?? I’m just tired of going to the doctor to only be back two weeks later (it’s like non of the antibiotics are working or keeping the infection away.)