Hello, I'm sorry to hear you're struggling so much. I've been on depo twice and had a horrible experience when I went on it last summer. My periods had never been regular but the first time I went on it took that to a whole new level, so I had over a year without any then had some random ones. I didn't want this to interfere with work since I had no idea when or if I'd bleed, so I made the awful decision to go back on the thing that had messed up my cycle in the hopes of stopping my periods. The second time round, I ended up spotting for over a month at a time, so it actually made things worse. Luckily, I was able to use menstrual sponges so didn't have to change my services, but both my mental and physical health seemed to go downhill as soon as I got the injection last year. I am neurodivergent too and already have mental health issues, but my mental health worsened and I had various unexplained physical symptoms in the months the injection was in my system and afterwards on withdrawal (I didn't get it done again after the three months). I was desperate for the three months to be over which was miserable when there was nothing I could do but wait. Other than the injection, the only birth control I have used has been the combined pill, so I can't offer any advice on alternative contraception unfortunately.