Progestogen-only / Mini pill and lower back pain

I have been taking Desogestral for just over 6 months. It took 3-4 months of irregular bleeding/spotting before my periods seem to have stopped completely. I do notice that I have had several occurrences of thrush along with weight gain/increased hunger, tender breasts and occasional period like cramping without bleeding. Mood overall has been slightly lower and feel like I am prone to pms symptoms still (teary, low mood) at the time I would have previously been due on. Had been off contraception for several years as combined pill previously contributed to anxiety/depression. Wanted something to control v heavy periods and not impact mood greatly and this seems to be working so far despite some unwanted side effects

Started this pill as I had horrendous migraines on Rigevidon. Was excited to start the mini pill and to not have bleeds in between pills but was I wrong. The first 5 months I’ve had random bleeding- which I expected (but not for over a week straight) I’ve also been heavily dizzy, nauseous and have had 0 sex drive which has affected my relationship heavily.

I have only been on this pill for around 2 months however my side effects have been so drastic in this time period. My mood is unstable and I have become more irritable and quick to be upset, as for periods they have been irregular and my cramps have been the same if not worse than before i started contraception.