Sounds painful Dave! When it comes to the shortgame there are two things that help keep me on track.
The first is practice, practice, practice - there are in infinite number of shots you can encounter around the green. By practicing from everywhere around the practice green I'm training myself to have a good muscle memory reserve. If you do this effectively, you can correlate to just about anything you encounter on the course.
The second one if my pre-shot routine which includes not addressing the ball until I've made a couple good practice swings. Focusing on a consistent pre-shot routine helps me get my mind off of the pressure and focus on executing my next shot. Once I've made a couple good passes that will yield the shot I'm trying to hit, I feel confident enough to step up and do it.