I am having constant pain every month, about 10...

I am having constant pain every month, about 10 days before the start of my period. The pain comes every 2-3 hours and lasts for 10-15 mins. It is very strong, I feel it very sharp in my pelvic area and it radiates towards my spine and back, hips and knees. It doesn’t go away with painkillers, it affects my daily life and activities such as working out or intercourse. I went to two doctors since I suspected endometriosis, none of them wanted to run further tests after I told them that the pain stops 2-3 days before period and no pain at all during it. So they ruled out endometriosis. I don’t know what else could it be, I don’t know what other tests to run and I don’t know how to function normally, since my mood is affected by the pain as well