Hi- fellow applicant here 
I think what will really help is if you unwind (like the others have said.) Try something new or find a new hobby (just for fun, not as a serious ec preferably.) Maybe start bingeing a tv series.
I would also avoid consuming boarding school related content. I have said this somewhere on this site before but failed to follow through with it (I am a hypocrite, sry!) so it didn’t work for me but maybe it would for you? I really get the feeling of dread as well. It’s so hard to kind of just let it go (even though we want to so much.)
I think a good thing to remember is you are amazing regardless of the decision. By going through with applying you already set yourself apart from the majority of students in the world! We still have our whole lives ahead of us, and the experience we gained from this process is priceless, even if we don’t get the outcome wanted. Best of luck to you!!