I take propranolol tablets ,(40mg) prescribed by the doctor for anxiety. Last night I was attending an event I was very anxious about so I took one but didn't feel it was working so on the way there i took another. A couple of hours later during the event I fainted out of the blue. There was a big fuss & the organisers wanted to call an ambulance but I refused. Still feeling awful today. Any ideas if this could be linked to the propranolol or not?