Hi @Infinity101 and welcome to the forums. Here you will find people to listen to you, support you and even socialise with you. It's a safe place to make new friends. It sounds like things are really rough for you at this time and I feel for you. As well as people with similar diagnoses, of which there are several that come to mind (but they will have to tell you themselves) and other shared experiences, there are also plenty of us here that have struggled with drug and/or alcohol addiction. Myself included. I'm 56 and only managed to finally stop 6 years ago, after 30 years of chronic pot smoking. And I mean chronic. Drug use is common for people with a trauma history and you might want to google 'self-medication' to understand more about that.
I have bipolar 1 (the 'manic depression' you refer to might be called that these days) so if you want to talk about that side of things with me you can.
I have also had lots of contact with police over the years, to the point that just seeing them can cause my complex PTSD to flare up. And had a partner who served time.
So if you want to chat to me or just someone to listen I'm around. As @Bunniekins said, just put an @ and you will see a drop down box, then type the name you want slowly (no spaces) and it should show in the box and you can click on it.
You can use the search bar to find a few threads about life with bipolar (one of them is 'Managing Bipolar1') just put that or whatever topic you are looking for in the search box at the top of the page and a list of threads will show up. A couple of social threads are 'Friday Feast', 'Saturday Soiree', and 'A Long Rave' - on any of these you can just drop in, and will meet some more forumites.
Hope you have a peaceful day. Look forward to hearing from you sometime.