Just reading your post reminded me of when I experienced these attacks, I finally learned that it was endometriosis and I ended up having to have endoscopic surgery. These attacks don't stop either, mine got worse and they used to happen about 4 days after I had my period. They were VERY painful and I would be in horrible pain for about an hour until they finally subsided and I only had a warning of maybe a few minutes before the attack would get really bad.

So, with that in mind, please make it a point to see a doctor about these attacks, and often they won't be able to see the endometriosis unless they do the endoscopic explore as it isn't seen through an exam or even an ultrasound. It can spread to other parts of your body so it's important to see a doctor.