Earlier quoted context omitted.
But if you can manage to not think about it until say 19:50, you will feel less busy. Working on your current task with 100% dedication, spending your breaks looking out the window just watching the birds land on the branches of the cherry tree will make you feel less busy, I guarantee it. Edit: Not that I ever manage that myself of course but the theory is sound.
I can't say that I'm perfect at this, but I've found that to-do lists are a great way tool for helping me not think about things: Knowing that something is on my list and so I won't forget about it allows me to push it out of my head far more effectively.
At least for me the key is to aggressively wean my to-do list, keeping items on it that I'm highly likely to complete in the next few days, as opposed to an ever-growing wish list.