100%: if you are not accepted to Yale it will NOT be b/c of a handful of minor typos in your essays.
Find a better way to deal with your anxiety. You have no control anymore: you will get in / deferred / denied. Either work hard at putting it out of your head- pick something to do every.single.time you start getting anxious: go for a run / do a chore for your household / dance to music in your room / work on a memorization task- anything that requires your brain to do something more useful than stewing.