I plan to attend a concert in August. Before my ticket was purchased, I was fine. But once it was finally set, I've been overly anxious. I've felt nauseated and upset all day.

This is supposed to be a good thing. A birthday present to myself. And now I don't think I can enjoy it. I'm trying to find a way to back out and I know that I shouldn't. I'm attending with my sister and a friend and I know they're both looking forward to it as much as I should be. Actually, I think they're more excited than I ever could hope to be. They've been trying to get me to attend a show with them for months.

I don't know what to do.

I'd really like to go. But I don't know if my anxiety will let me.
How do I conquer it?

I've got until August 25. Any suggestions?