Have you read 'Do It Tomorrow' by Mark Forster? http://www.markforster.net/do-it-tomorrow-chapter-one/
He puts all tasks/NA's in to 3 categories; Immediate, Same Day, and Tomorrow. The difference between the categories is the size of 'buffer zone' requried between you and the action required to impose order on your workload, not how important it is. The theory is that by imposing order on an otherwise disordered set of actions you can avoid the trap of either constantly putting off things you don't want to do, or as in your case trying to do everything now.
I'll admit that I haven't finished the book yet but it sounds like it might help! (be reassured that it's quite a slim volume and won't take long to read )