Getting scared now

So trial starts tomorrow. Which means I should be panicking a little. Well I am - I had two nightmares last night, which - while not too unusual - is almost certainly connected. But it's actually less about what I'll say, and what they'll say, and more closely connected to the fact that I haven't been told if they need me. I know they want me on the stand, and I know trial starts tomorrow. But not where the court is (this isn't in my city so I need to travel) or even if I'm wanted tomorrow. So I guess I just have to rock up and see - gonna feel so so out of place. Can't believe a friend's life is resting in my hands.