Both of the things you describe can be a way of Self-medicating ADHD, and even anxiety. A video game is more stimulating to your brain than a walk. And the ADHD brain craves the stimulation it’s lacking. And alcohol can be calming. It also helps you “fit in” in social situations.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism