You can check into the meds. I won't touch them.
Back in the 60's-70's when I went through grade school they used "the BOARD of Education" to keep me focused. Both my parents were educators and were diligent in teaching me ways to maintain focus. Books and puzzles, both tactile and written, were always in my hands.
Preparation is the KEY. Yes Have a Lesson Plan!
As a director I realized that some of my problems were self inflicted so I started to anticipate the problematic concepts and would have my explanation ready(rehearsed inside my head. Score Study is a must.
Information I relate to students is almost always in written form. Game times ,reminders are sent to them via REMIND or a physical note. "Mr. S What time do we leave?" "Look at your REMIND"
I start each day at least an hour before I see the kids to mentally/physically prep myself.
I am TERRIBLE at concerts if I don't have a script. I even struggle writing this reply because my thoughts are so random.
My office is a mess. I struggle, but there is no better job for me. I love teaching kids and music is one of the most worthy disciplines.