I prescribe beta blockers for anxiety-as with all these things, some patients do really well, others don't. It's usually a matter of trial and error. They seem to be useful at "mopping up" the physical manifestations of anxiety, fast heart rate, sweaty palms feelings of panic etc.
In answer to your question, its likely you'll get away with it, but as my learned colleague points out, sinus bradycardia could trip you up either on physical examination or on ecg. (Quite common). If detected, you could be opening a can of cardiological worms unless you own up to using them.
Potentially, bronchospasm, although rare, could either kill you, or at the very least, affect peak flow.
The act of blatant deceit is perhaps the most worrying thing though
