I can certainly relate. I am very much in the same place as you. I struggle with ADHD as well. I was only diagnosed at age 34 while in rehab so I had already ruined my career by then. I struggle to maintain employment and most companies won't hire me because of a DUI and a bankruptcy on my record.
Right now, our first concern should the alcoholism. my biggest obstacle to rebuilding my life had been my drinking. That's what I am focusing on for now. I've been fired from my last 3 jobs indirectly because I can't stay sober. My ADHD, depression and anxiety can't be properly treated until I get sober. I just joined AA to tackle that.
I think that should be your first step too. Tackle the drinking and go from there.