Help please!

Not sure how to even word this.

My husband and I have sex at least every other night. During sex if I get off before he does I start to hurt sooo bad after about 3 mins we can’t continue, but if he gets off first then I can go all night unless I get off. So pretty much I’m saying every time I get off I hurt down there very very bad. I got tested at my health dept for STD’s and I’m clean. They told me to go to my OB/GYN. They can’t get me in until the 12th so I decided to ask for opinions.

Also it is not from not being wet, I have no problem with that.