I would not expect beta blockers to be very effective for dating jitters. They would block some of the physiological effects of anxiety, but not the psychological aspect. Your heart wouldn't be pounding, etc, so that might make you feel a bit better, but the anxiety would still be there. For an acute episode, I would think that a benzo would be a better choice and an antidepressant as the long term drug to use. I am, however, an engineer and psychopharmacology is only a hobby. 
_________________
That was the equation!
Existence, survival must cancel out programming.
Aspie Score 141 of 200
NT Score 50 of 200