Ethinyl estradiol / norgestrel
"I experienced increasing endometriosis pain for 4 years which culminated in two months of extreme continuous pain.  I was reluctant to try anything that changed my hormones due to negative experiences with birth control in the past.  I was given Low-Ogestrel when I went into the ER for the endometrial pain.  I took it that night and woke up pain free the next day!  This one tiny pill gave me my life back.  I was astounded.  I had slight nausea for the first few days but that subsided and I have experienced no other side effects."