I am diagnosed ADHD. I find that music keeps the distractible parts of my mind sufficiently busy for me to deeply concentrate on a single task. I am hopeless w

I am diagnosed ADHD. I find that music keeps the distractible parts of my mind sufficiently busy for me to deeply concentrate on a single task. I am hopeless without headphones. I continuously twitch my one leg, a coping mechanism I picked up when I was very young. Finding a new job that stimulates you might help, or carving out a piece of freshness (invent/identify a problem and solve it) in your existing job - that will force you to learn the codebase as you improve it for your pet project.