i get a rapid heart beat that i can feel pulsating throughout my body. it is such a 'hard' beating that it feels like it is actually moving me with each beat. i begin to get dizzy and think that i might faint. it started with my first pregnancy, which i think put extra strain on my heart- that caused me to become symptomatic. it happens at completely random times; therefore, I do not believe that it is associated with anxiety or panic. When I get tachycardic, I know that I should count my pulse- but once it starts, I generally feel like I just need to lay down- Quickly! I find a dark room to decrease all stimulation and lie on my left side for better circulation, still it takes usually 15-25 min for the episode to resolve. any idea what could be causing this?