This may be a silly question but is it possible for a shock to make you flip back to AF? I had cardioversion 3 weeks ago and everything was going ok. Was feeling better than I had for ages. One night, about a week ago, one of my neighbours decided it would be a good idea to start burning some rubbish in his garden. It was about 1 am when an very loud bang woke me up. I don't know what he had put on the fire but it had exploded, I could literally feel my heart pounding like crazy in my chest. Since then I've started to feel breathless again and ecg shows I have flipped back so am now having to take more medication. Could that shock of the explosion of caused it or is it just a coincidence?