Endometriosis Support Group
Endometriosis is a common medical condition where the tissue lining the uterus is found outside of the uterus, typically affecting other organs in the pelvis. The condition can lead to serious health problems, primarily pain and infertility. A major symptom of endometriosis is pain, mostly in the lower abdomen, lower back, and pelvic area.

I have never taken femara though, so it is possible you aren't reacting well to that or the norethinodrone (everyone is different) it is hard to tell when 2 medications are started at the same time.
I hope you get some relief. :-)
Anyway, I hope eventually the norethindrone works as well for you as it has for me. :-) Good luck!