Progestogen-only / Mini pill and lower back pain

I got this pill after being 25 years on Yasmin but started to get headaches and turned 40 so was made to switch to Desogestrel. I didn't get headaches but everything else just got bad, was told to stay on it 6 months to get adjusted but after 5 and half months I finish the pack half way as I was getting really frustrated with it all. The side effects have been horrible - oily skin, scalp and nails, acne, hair loss and hair thinning, random spotting and I gained 15kg, I have never been so huge! I just hope all will return to normal soon as it's been very depressing.

I really wanted to like Desogestrel. Initially, my skin was the worst - so oily and immediately broke out in painful acne. This quickly subsided after about 2 weeks. For 3 months, my breasts were so enlarged and sore all the time. I noticed around the 3 month mark that I was experiencing vaginal dryness too. My periods have been totally irregular - since starting Desogestrel in May I've had 10 periods. Many of these were trigged by intercourse. The volume of blood and the level of pain was variable for every period, making it hard to predict. The final straw for me was I started losing my hair around the 5-6 month mark. My hair is noticeably thinner on top and the ends are ruined / look awful. The only positive for me has been that it made me more energetic and have a better / more even mood. It did has not affected my sex drive and I gained a negligible amount of weight.

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