Hi annepl. Good to read your post. As a follow up, blood tests for potential kidney and thyroid problems came back negative which was good, another protein (?!!) that affects heart function was a bit down but not enough to cause a heart attack. My heart rate has certainly stabilised, but to be on the safe side I was fitted with a heart monitor for 24 hours to check for any hidden abnormalities. I had this take off yesterday afternoon and the GP is ringing me on Friday for a chat!!
I'm on a very low dose beta, and although it's early days so far I've been fine, and its certainly calmed down my over enthusiastic heart beat which fingers crossed, appears to be normal! It was a frightening episode and although I can understand your reluctance , for me the beta did the trick!