my periods are literally so painful

He
Every month I have the worst pain I would never wish on my worst enemy. My fertility doctor says I don't have endometriosis, so what else could the pain be from?? Any ideas on how to soothe the pain or even ease it? I'm at my wits end, and I don't know what to do. Advil doesn't help, neither does naproxen, tramadol, midol, pamprin, NOTHING.