I am 54 years and have a parental history of angina, and heart failure. When i started getting occasional Arythmia and a fast heartbeat my doctor put me on Avernol 6.25mg (Carvedilol) to slow my heartbeat down, i am concerned with the possible side effects, and my irregular heartbeat may get worse, should i be? My BP is always above 'normal' say average 135/90.