Progestogen-only / Mini pill and lower back pain

i’m not sure if it is normal but i have been on this pill for 3 months. a week into the taking the pill my period finally came back after around 100 days. since then ive had very irregular periods often bleeding for extended periods of time and also spotting more often with the periods being closer together. i have also experienced much more mood changes as i have felt somewhat more depressed on this pill. this might just be my experience and might also be influenced by the fact i am still going through pubity as i’m 16 yet i still can’t stop thinking that something is wrong .

Started this purely to help my skin after experiencing constant hormonal breakouts, which it did clear up and meant I could eat however I wanted basically with no consequences on my skin (sugar and fatty foods). However I feel as thought the pill has really dampened my mood making me low level depressed all the time. Also experienced a decreased sex drive and lots of hair loss - but still unsure whether these are directly related.

After coming off a combined pill (Yasmin) that I was on for 14 years - I am now on Desogestrel, within a week I suffered a mild acne rash/breakout on chin and neck but some gel from my GP quickly sorted that. I am now 2 days late to what would have been a bleed/period and my lower back and period cramps are quite severe and prolonged - my breasts are bigger and tender to touch - hoping these symptoms begin to decrease if I get my bleed or not! Saw GP today to discuss and they’re just general side effects whilst my hormones adjust (I’m told to allow >3 months to review) - general mood has decreased a bit and I feel a bit numb emotionally but started feeling better today so fingers crossed I’m on the up!