most of my back pain and abdominal pain went away right after removal. i felt like my uterus had been balled up for 3 1/2 years and that tension released immediately. i have to admit i was on a natural high when i finally had it removed. after all my life was a living hell on mirena. so my reaction after removal may have been mostly mental. i wish i had a good suggestion for your back pain.
it is good you are having a period. it helps get those synthetic hormones out faster.