I’ve been having this kind of arrhythmia for ten years now, since high school. My heart pound quickly two times then back to normal. Sometimes one is louder. I burp a lot when this is happening, sometimes I feel like air can’t get out. I get anxious then, and that makes everything even worse, like I would get shorter breath and it would get hard to talk. The worst is when I’m lying down. I’ve noticed that tabs against stomach acid actually help me, but I keep getting anxious if I am gonna die.