Hi, my heart keeps missing a beat and beating hard whilst having a shaky feeling in it. Was just happening when sat still but now when I pick up my daughter, go upstairs etc. my pulse seems normail, in fact quite low about 55 bpm. Waiting for echo as dr thought could hear murmur too. But now symptoms worse. I normal do an exercise class most mornings but worried to go incase get symptoms. Should I excercise? What is happening to me? Also feel as if I have a wheeze deep inside chest that I can t get too.