Zen Buddhist practice could help you but the important thing is discipline. Two ways of dealing with racing thoughts and impulses. A. Put them off and think about something else B. Have a little notepad with you and write out the intrusive thought and tell yourself you'll look into it later when your done reading. When your reading take breaks. Don't try and get through it cover to cover in one sitting. Read a couple paragraphs then pause or read one chapter and take a 30 min break. Put on some relaxing music. Maybe some free jazz or trip hop or whatever calms you down but make sure its not something exciting, loud, or fast paced. Take notes, underline, argue with the book like your talking to the author directly.