For me, yes. But perhaps this is an area where there is high individual variation?
no
To me this is the difference between ADHD and just being alive and having to do things that you don't want to do sometimes. I don't mean to be dismissive, I struggle greatly with the same things you do - but I avoid trying to solve things like this through medication.
Yes would be consistent with ADHD or many other things. No would be consistent with ADHD also. Hyper focus is a common symptom.
Do you also avoid caffeine?
No, but I should. I suspect it does not really helps me focus, it just makes me feel alert and gives me a buzz. It is the last addiction in life that I have not been able to shake.