What Causes Severe Pain And Fainting During Menstruation?

Hi there. I am taking tylenol 3 for pain during my period, which lasts 4 or 5 days per month. The T3 helps the pain, but I always end up fainting and throwing up during this time. I drink a lot of water to stay hydrated, I drink a small amount of sports drinks for the electrolytes, and I eat fruit every 2 or 3 hours to keep my sugar levels up, but none of this helps.