Uterus pains

So I’ve had pains in my uterus for over a year now. Didn’t think much of it at the beginning but it kept getting worse. I’ve had almost every test under the sun done and nothing. It’s not only around my periods, it’s constant. I cant have sex/pleasure myself without being in excruciating pains. The gynaecologist was 99% positive I had endometriosis. So I went in for a laparoscopy 3 weeks ago and to my surprise they found nothing. Has anyone had this? Or have this? What was it? What does your doctor think it is?

TIA ❤️