Yes, every time. My nightmare is - I will forget the most basic code or my personal message will pop-up on the screen, the worst - my slides will be deleted.
So interestingly, if I prepare my slides and footnotes with content then definately during the session I start getting nervous. So, I always give my sessions from my experience. In this way, I don't have to memorize anything.
One of my friends once told me - "It is always good to be scared before going to stage. This shows that you still care to give presentation and you are not over-confident."