I recently had what I think is an Arrhythmia, that lasted almost 30 seconds. it might sound dumb, but I gave myself a hard thunp on the chest, and it stopped. If it had continued, I think I would have been sick or passed out. I am presently taking Norvasc, Atenolol, and Pravacol, for Angina. I have had these Arrhythmias before, but they were not as long as this one. Is this cause for concern?