I feel for you. I own my own Omron blood pressure monitor and recently it showed the irregular heartbeat symbol. I too am worried about dying and have been distraught over the symbol, which has never shown previously in the 12 months I've had the device. I'm wondering whether a low battery life might have something to do with it, but every time I google, it says battery life plays no part and that I could be having a heart attack. I'd like to see my GP but you just can't get an appointment where I live. The more I think about it, I have been getting occasional discomfort in my left arm, but now can't tell if this is all just in my head.
Sorry to hijack your thread. I hope you are doing better.