I would like to know whether it's normal to experience a strange sensation in your chest, as if you can feel your heart nearly jumping out of your throat with a pacemaker. I've just experienced such a feeling and it was really scary. I have experienced 'flutters' before but nothing as strong as this. Could it be the pacemaker kicking in, and therefore nothing to worry about? I am really tired at the moment and a little stressed (more so since experiencing this 'flutter'). Thank you for your responses.