Struggling to Focus: Any Tips?

They won't medicate me for it, because I'm bi-polar and they're afraid I'll have a major manic episode! I drift. That's what I call it, and I often can't stop it. Being aware of this I don't think it's about focus. I just try to make it as I shift or drift so I have a way to follow things back to where I started. That's when I talk. I prefer to text. It's easier for me to see when I start to drift. I can fix it. Even being alone though, I'll have to watch scenes in a movie repeatedly because my thoughts are way elsewhere. If I ever get things going with someone she's going to have to be pretty understanding, otherwise it'll probably drive her batshit!