Hi. I was just wondering if anyone has experienced a bizarre symptom I get recently. It is a single sudden thump right in the centre of the chest, usually when I stand up from sitting and start walking a few steps. I really don't like the feeling of it.it feels like my heart has dropped down a bit. Very hard to explain but it feels very wrong. I am very familiar with what AF and other arrhythmias feel like but not this strange sensation. It is happening more and more frequently too. Also, when I am in AF these days, i find a sensation like a lot of pressure in my chest and like i can't get a full breath in. I have never felt AF so physically uncomfortable as I have of late. Can anyone relate to these symptoms or does anyone have any explanations?