Sounds like you're coming down with a case of checkrideitus. It's something that nearly all of us fight, to one degree or another, prior to taking a checkride. How to deal with it? We're all different and what works for me may or may not help you.
Remember, your examiner isn't looking for perfection, they're basically just looking to see if you stay within tolerances and are safe. To date, throughout the entire history of the world, no one has ever flown a perfect checkride (or flown a perfect flight for that matter) and you will not be the first. Just do what you've been trained to do and everything will turn out just fine. But, if you find yourself crosswise with any given manuever, simply correct yourself and move on. Unless you've done something totally off the wall it probably won't even be mentioned.
As far as the oral goes, be very careful not to tell the examiner more than you know. Answer the questions simply and directly, nothing more. He/she will be able to tell very quickly when you're in over your head.
Remember, anyone can bust any checkride on any given day. I'm not telling you this to get you wound up, but simply to let you know of the possibility. If worse comes to worse it's really no big deal, you just have to go back and demonstrate the manuver(s) that you were found lacking in.
If you're going to make aviation a career, then you'd better get used to the fact that you're going to have to take checkrides on an ongoing basis. It doesn't matter if you're flying charter, corporate jets, or for the airlines, you're going to have to take what amounts to a instrument and type-rating checkride every 6 months. After a while, it's not a big deal; but I admit it's not my favorite thing to do.
Relax.
'Sled