Anyone know what this could mean?

Hey guys! 
I've had a period for 13 years now, never had any issues with it until November last year. Extreme menstrual pain. I'm talking; can't stand up straight, speckles in my eyes, pale face, unable to talk (which is quite the thing for me..) etc. 
I had my hormones checked, dr's said they're fine, but idk why this pain would be coming out of nowhere? 
Any suggestions?