the racing heart and palpitations (pvcs) drive me crazy too. i find them to be the most uncomfortable of my laundry list of symptoms. i have a psvt, which is a sudden, out of nowhere, speeding up of the heart. mine will go from about 70 to around 190 in seconds. it inevitably causes a panic attack, which i cannot help, until it stops on its own. i can no longer do any physical activity, even on the days that i feel like the rest of my body would allow me to, because i am so terrified of the heart arrhythmias.
i take beta blockers. i have been on them for about six months, and they have helped a great deal. my resting heart rate, which had been close to 100, is now around 70. i have less pvcs and the svt is less frequent. but still occurs.