Chill.
I have nightmares about these sorts of things. But then I got to thinking about what it would be like if I were an adcom. I'd be reading your essay and at the ends I would say to myself "hmm, word missing". And then a split second later I'd be saying to myself "nice essay" or something. A second after that I don't even think I would remember your cut off word.
How often to you read national news articles with missing words or extra words. You notice it, sure. But it does NOT get in the way of your impression of the article unless they are all over the place.
I know you are freaking out. And I know it will take more than my words to help you. But, seriously--it's Ok to chill about this.
BTW, I have the same stats as you. Thoroughly middling. We'll be fine.
Judd