Question about going to a psychiatrist for a specific nerve-wracking event:?

I have to give a few speeches for class and I dont think I can do it without passing out or vomiting, or having a heart attack. I have horrile anxiety. Can I make an apt. with a psychiatrist just to ask them if they can prescribe me pills to calm me down just for this class? And not to be on anything long term? What would happen If I did that?