Cerelle pill and lower back pain

I used this for 6 months hoping my body would adjust but had to stop. My periods became really irregular, and super heavy. The first month, I had 2 periods (both lasted around 10-12 days), second month I got one period, 3rd month I got nothing, and then months 4 - 6 I had 3 periods in 7 weeks, all lasting around 12 days and far heavier than my normal periods. I felt like I had backache most of those last couple of months as that's something that happens whenever I'm menstruating. I've tried other pills and never had side effects like this, so I've stopped these now and will go back to another type of pill.

I'm giving this pill more time because maybe it's just an adjustment. But I've been a bit weepy with sore breasts and spotting every week. Also a really tender feeling in my lower abdomen-especially during sex. Which I hate obviously. So I'm definitely not getting pregnant because I no longer enjoy sex.. so in that respect it is effective. It's getting one more month and then I'm done.

I suffer from migraines and was convinced to try this contraption as a way to prevent hormonal fluctuations and therefore prevent them. This pill left me with status migranosus / intractable migraine. It was horrific