I'm freaking out, and I feel really, really stupid about it.

Tomorrow, I have to give a short presentation (about 10 minutes). I really don't think it's a huge deal; my boss gave it to me, a pretty low-level employee, so she can't be that worried about it. But still, I am representing my organization at this thing, and there will be colleagues there whom I'd kind of like to continue seeing me as a competent human.

The last time I gave a presentation, it was in college. It was my senior seminar presentation. I made a mockery of the whole thing and was amazed to pass the class.

But that was years ago. I am on stage AL THE TIME! I don't really talk on stage, but I perform a hell of a lot. And I talk about this stuff at work a lot. So I figured I should be okay, you know? I'm not that scaredy-cat college student anymore. Right?

WRONG! I am fucking terrified. I have no idea how I forgot the horror of public speaking up until today, but now I am freaking the fuck out. I have felt physically ill all day long, and now I am going over my presentation and everything is wrong. I want to curl up into a ball and die, because otherwise I have to speak in front of actual people tomorrow and WHAT THE FUCK WAS I THINKING????? I am dizzy. I might vomit. I might run away and hop on the first plane to Yemen.

Help.

UPDATE: Thanks for all the advice, everyone! I'm still pretty freaked out, but I'm going to practice some more, drink some chamomile and yawn a bunch, and we'll see how it goes.