Congratulations on overcoming your addiction. That shows remarkable courage after leaning on alcohol for so many years.
Studies show that people with ADHD who aren’t treated, often turn to drugs and alcohol to self-medicate. You seem to be a classic example of that. The good news is that now you’re getting ADHD treatment, and it will help you stay sober.
Your doctor should have started you on the lowest dose (18 mg for Concerta) and increased only if and when needed. ADHD medications are dosed by individual neurological needs, not age or size, so you start low and work up until you hit the “sweet spot.” The fact that your doctor doesn’t know that this is the standard of care for ADHD signals that you should probably have a specialist managing your ADHD treatment.
This medication primer outlines this and so much more:
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism