Desogestrel pill and irregular periods

I had always suffered with very minor anxiety, however once I went on this pill I was a wreck. It was like I became a whole different person, I was irritable, mean, and I was constantly upset. In the space of a month I went from a D to and E, and I gained weight like I never have before around my lower stomach. I had always been rather skinny around there, but even after 2 years of not taking it, I have never been able to return to how my body was beforehand. The first 2 and a half weeks were normal, but after that I bled consecutively for 9 weeks, with a few 16 days staggered in between where I only briefly spotted.

I was on this mini pill for just over a year after switching from the combined pill. It slowly affected my mood to the point where my mood was constantly flat and I didn’t feel excited about anything. My libido was also very low. I felt a massive difference after stopping. Positives were I didn’t have periods often (every 6-8 weeks) and not much period pain. The 12 hour window to take the pill was also helpful when I sometimes forgot, as some other mini pills have shorter windows.

I was constantly bleeding and around the third month I started seeing a pattern emerging that essentially flipped my natural cycle: three weeks of bleeding, 4–5 days off, three weeks of bleeding, a couple of days off. It had a bad impact on my mental health, made me feel exhausted most of the time and killed my sex drive, ultimately leading to a breakup.