I have had 2 incidents in the past year that have ended me up in the er. Both incidents were very similar in nature. It started out with continued heart palpations for around 12 hours. Anywhere from 120-180 bpm resting. Both times I had infections, UTI (ONCE) and upper respitory (once), and both times my menstrual cycle started the next day while I was still in the hospital. I have seen several DR. and none can find an exact cause. Some say beacuase of the infection, and anxiety factored in. I have had ekg's, and echo, mri, cat scan, blood work, and urine samples tested. My resting heartrate is a little higher than normal I am 22 and its normally around 88-90. Does anyone know what it could be? Or had a similar experince? They tried putting me on toporol, but I have normal blood pressure and it was lowering it to the point where I would feel faint. I dont want to have further problems so just would like some insight. Thanks.