I have 2 and the first one is: forgetting something important. Since our wedding is over an hour away I am SO AFRAID that I will forget something and I know that will really stress me out the closer we get.
My second fear is having my period for that day. I know it sounds silly but I want to be comfortable and not have to worry about that stuff. The last thing I want to think about is having to go to the bathroom to change my tampon, lol.