Endometriosis?

So before my period starts I get pain cramping uncomfortableness to the point where I need a heating pad, then i realize I get left pelvic pain that I really couldn’t describe to the ER or gyn because it’ll last a little after my cycle is over and plus during my cycle! I was diagnosed with endometriosis! (Possibly) so I’m wondering if any other women has felt this or goes through this