Thanks, Denise. I agree; I have often learned things from pharmacists that docs SHOULD have told me. To answer your question, I have been taking that med for about 6 months, but had not put out enough physical effort to have that reaction before. I ski all winter (3-5 times a week as I live at a ski area) but that is pretty low on the scale of physical effort.
I just did a couple of 10-15 mile bikes rides in the last couple of days, and made sure to rest before I needed to, etc. No repeat incidents. I see my regular doc later this week, but don't expect any revelations. My attitude at this point is to assume the medication MAY be a problem and to watch carefully for a repeat incident. Beta-blockers are pretty common meds, so I am asking around.