Help! Advice needed!

So I've never posted on here before but I really need help or some advice. I keep experiencing a lot of burning, and sometimes it turns into sharp pain when I'm having sex. I can go one time usually but sometimes it hurts too bad to even do that. My man and I used to go at least twice every time and now I can barely go once without being in god awful pain. It's not that I can't get wet either I actually get really wet so lube doesn't help anything. I'm going to the doctor about this but I was hoping someone could give me some advice before I go.