Bro I feel you I never thought of that before, I’m also left handed, stutter, and daydream a lot like everyday. I also have adhd but you got a point one of the causes of stuttering could be from dopamine. I never took speech and has been suffering from stuttering, daydreams, and adhd for as long as I could remember. I think you should look into it, tell us if you have any results and stay strong, stuttering is a invisible struggle that is underwhelming not notice.