Burning after sex

Princess

I’ve had this problem for almost a year now. Where after a few times my husband n I have sex I just start to have a burning sensation. We don’t have anything. We’ve been checked. My urologist thought I was having dysfunctional voiding & now that that is not it anymore I don’t have a follow up with him. What should I do? It’s frustrating to just get antibiotics again for a uti or a yeast infection when even that comes back as nothing..could it be my ph levels that are off balance?? What should I do