Progestogen-only / Mini pill and lower back pain

I had my first postpartum period without any birth control and it was a bit heavier than normal (pre-pregnancy comparison) but not too bad honestly, the cramps weren’t horrible either. Then my second period I had been on Slynd for about a month and it was HORRIBLE, I’m a medical nurse and I have an relatively high pain tolerance but I considered going to the hospital. The first night I was having multiple medium sized clots that my coworker said looked like it was uterine lining, heavy heavy bright red bleeding and horrendous cramps that made me want to vomit. Plus my uterus was contracting so much I think I went #2 like 5x that day alone. Day 2 was slightly better with slightly less horrible cramps but still relatively heavy bleeding and some small clots every hour or so. Now day 3 and I’m heavy bleeding still and now have some sharp lower abdomen pain especially when in the motion of going to sit down or stand up. I’m hoping this stops soon because this has been the worst period I think I’ve ever had and pre-pregnancy I thought I had some pretty bad ones. I don’t think I will be continuing this birth control

I’ve had nothing but cystic acne, heavy bleeding for 2+ weeks at a time, hair growth is still the same rate if not even worse.

I have suspected endometriosis and this has been life-changing for me because it's completely stopped my periods! However, it's also given me spotting after sex and bouts of stubborn thrush. The thrush almost made me quit, but the benefits (no periods or crippling cramps) outweigh the cons. I'm also happy that it hasn't affected my mood at all because previous pills made me extremely depressed.