Just another plug for Propanol, in as low a dose as is effective. Even if you feel confident and relaxed, your body might play an adrenaline trick on you - the fight-or-flight shakes, dry mouth, etc.
If you can somehow will yourself to prevent this physical reaction, then great, but if not, I would not dismiss a little help. It may be possible that with a number of shake-free performances under your belt, you might have the confidence to try weaning off the medicine.
My opinion only, of course.