I'm in a somewhat similar situation. When younger I didn't get intense pain or hardly much pain at all. After having my son nearly 20 years ago, things changed and I began having cramps and understanding why some women would complain of them. They were bad, but tolerable. Around 8 years ago or so I began having intense cramps which feel like labor pains and are of the same intensity. I went to a gyno and she told me to stay away from artificial sweeteners which I did....no help and it got worse. Went to another gyno and he told me that as long as I was bleeding regular, it was normal and nothing could be done but take meds for pain. At this point, I didn't bleed heavy and believed him. I was told by a few people it sounded like endo (I have intense pain in my back, front, inside and outside and when I have to use the bathroom when on my period I scream bloody murder and sure my neighbors can here me even though I live in a house that is separate from my neighbors house. I told my doctor and he acted like it was normal and to get over it. I began bleeding SUPER HEAVY and twice as long....told my gyno and he said it was normal. Asked about endo and he told me that even if I gave endo, studies show it doesn't cause pain so not to worry. I've been in tears for years over this mess....recently an artist I follow wrote a post on Instagram stating that extreme pain during menstration is NOT normal and not to stand for any doctor telling you otherwise. I went back to my gyno who ignored it again....I asked for an IUD to possibly help but when he attempted to implant it, he did something wrong and I was screaming and forced him to stop. I decided to try birth control bills but it's been 2 months and I really feel they've made the pain worse instead of better. I talked to my primary and he said they'd do a CT scan to rule out Endo but I looked it up and it says a CT will not show endo. I'm so sick and confused. So the short answer is, I don't know if I have it, but I too suffer with great pain in this area and my heart goes out to you. (((Hugs)))