endometriosis
"I refused to get the shot because I had researched Depo for a paper in college, but it came down to Depo or severe anemia. So I received the shot and the next morning I was praising Jesus because the shot got rid of the almost constant back pain I'd had for 2 years since delivering my twins. Doctors kept telling me it was a sprained muscle only it never healed, now I believe it was endometriosis."