I have been really sick for the last 2 days

to the point that it was a challenge to even stay upright for long on thursday, and I left work early today after saying something to my boss in a way that was not intended. I basically gave him an ultimatum when I meant to make a plea. I do not think that went over well. As of this post, I have written a page and a half long letter explaining and apologizing for being rude. I am going to give a copy to him and my operations manager as soon as I see them both.