I think I have a somewhat similar case. Whenever there's an important or interesting task at work, it's literally impossible for me to distract and stop before it's done. I can skip my dinner and sleep because my mind is fully focused on the task. Because of that, I can also do a lot.

On the other hand, I cannot watch movies or read books because my mind wanders every second and it's really hard to concentrate.

I also suffer a lot from frequent anxiety.

Anyway, amphetamines are not allowed where I live