Help! Should I see my doctor?

About every other month I wake up on the start of my period with horrible cramping. Usually for the next few hours I max out on what I can take for ibuprofen and Tylenol with little relief. The pain makes me nauseous and sweaty and I'm usually groaning or calling out in pain. I've been at work before when this has happened and was sent home because I couldn't do anything except for sit and hold my breath. I could barely drive myself home and I almost just drive to the ER in hopes they could stop the pain! I've read about endometriosis and stuff but this pain doesn't usually last more than 3 days or come when I'm not on my period.. so I'm not sure whether this is normal or if I'm just a wimp or if I should see my doctor. Any advice or experience with the same symptoms?