Progestogen-only / Mini pill and lower back pain

Got pregnant on it because I wasn’t taking it properly, since having my son and ensuring to take it regularly I have had no issues

I swapped from the combined pill to Cerazette because I was having anxiety, dizziness and low libido. These have both improved since changing. The most annoying thing has been inconsistent bleeding and spotting. I won’t bleed for 3 months then will have spotting out of nowhere for 3 weeks. I have also got acne on my chin which I didn’t have before. Overall though these extra inconveniences have far outweighed the reduced anxiety, dizziness and libido issues.

I tried the mini pill after experiencing migraines after 6 years on the combined pill. First I tried Zelleta which gave me such low mood and tearful all the time, as well as constant spotting. I wanted to try Norgeston as the synthetic hormone is different. My mood definitely improved (although a little more anxious) and I’ve had no spotting, but my periods are so irregular, really close together and so heavy I can get through more than 3 pads a day. I’ve had 2 periods a month for the last few months and will end up with an iron deficiency at this rate! Running out of options