I'm not familiar with your school system at all, but surely at this stage of the year you still have year 12/university marks to keep you occupied?Pls help how do I get UMAT out of my mind until results, it’s taking over my thoughts.
I know they're not emphasized quite as much at some of the Aussie schools, but don't you still need to be sort of top 1-5% academically?
If you need something to stress about, stress about that

Seriously though, Smelly boy pretty much sums it up. You're going to have to deal with this kind of anticipatory stress quite frequently during a medical career - best to start learning how early.