A month ago, I got really stresses at work and the left-side os my chest an upper abs twitch, Rolph and quiver. I get light- headed briefly and shortf breath sometimes. Never any pain. I too, went to the cardiograph doc and had the same tests and couldn't find anything. I have it all day and night long. Sometimes I feel my pulse and it skips a beat or two on occasion. I work out all the time,play tennis, ride my horse and work-out at the gym. I eat very little fast or processed food. I want if to stop. Any ideas who I can talk to? Or what kid of health professional to visit. I am so glad I found this web site.