Does progestogen-only / Mini pill cause cystitis?

Was always on my period when taking this pill, bled non stop for 3 months. Was horrible and gave mood swings. Stopped taking in the end as could barely have sex as constant bleeding, so wasn't even worth it.

I was on Cerazette long term previously and had no side effects, it was great. However, since returning on this pill I am still getting irregular periods 8 months in. I'm not sure why my body is not as accepting of this the second time around. Recently I have lightly bled this month (March) for a couple of days and the last time was back in November. It has caused some concern with no diagnosis from my GP other than my body accepting the hormones again. I also suffer from sore breasts, I am considering going to the GP for this if it doesn't improve. I have noticed on my last refill that Cerazette is no longer available to those at my GP surgery in Bristol on the NHS which is a shame as the generic brand has a funny taste. I like the fact there is a 12 hour window and no gap in pills. I hope in a couple more months the bleeding will stop completely however the spotting isn't enough for me to want to switch methods.

I've been taking this for years now and it has been able to stop my periods which is why I wanted to take it in the first place. The only issue for me is remembering/being able to take it at the same time everyday. If I get my timings out of sync then I'll end up having a period. But, the periods I do have are generally less painful.