DR. SAID, IT COULD PROBLEMS being on NADOLOL to LONG OF TIME! ??? Says the top part of heart isn't communicating with the lower half, need a Pacemaker. I've always excerised, walking 5 miles a day, not overweight, NEVER smoked, social drink 3-4 a year since 30..I DON'T UNDERSTAND, Why Dr put me on something for 5 months NOW SAYING CAN'T BE ON NADOLOL TO LONG, WILL CAUSE ME MORE PROBLEMS? ??? HELP PLEASE. I was trembling & blacking out standing, sitting, or laying down when I started seeing a Dr.