Work with a professional. From numerous anecdotal stories, if you do have ADHD, taking medicine such as Ritalin or Adderal will radically alter you (in a good way). 15+ years ago, I had a psychiatrist who insisted I had ADHD. I took Adderal for a couple years. It did absolutely zero for me. Not one iota of change. I know others who swear by it. There was another comment in the thread about anxiety and hyper vigilance being a problem with similar symptoms. After much work, it's safe to say this was more my issue. There's a book called "Driven to Distraction" that is decent as well.