We were all scared...you'll be fine. There's really nothing anyone can say! Every labour is so different! GET THE EPI! haha
Also keep in mind that your peanut is feeling all of this anxiety and tension. If you aren't sleeping or eating enough, then it will affect you and the baby! Try to relax, because this will be the last time you CAN relax and have time to yourself for QUITE some time. I know you've probably already heard all of this but it is SO true! Put your feet up, be a couch potato, read a good book, go out, do a hobby! You wont be able to have time to yourself for a long time so take advantage of the time you have left. You'll have to go through labour wether you want to now or not so you might as well not stress about it so much, you can't go back now!
I really don't mean to sound so hard and I do apologise, but worrying and stressing will do much more harm than good now! This is about your baby, NOT you.