I am taking Nebivolol Clorohydrate for my arrhythmia...I have gotten better since I started the medication a couple of years ago. I haven't made a full-scale investigation on my heart condition yet to my wife's despair so I cannot provide you with details on what is causing the problem. The pre-diagnostic related my arrhythmia with my valves not being young anymore but obviously that was a dismissive take on it typical of a cautious pre-diagnose. Anyway, as you said panicking didn't help at all. On one occasion on which I did panic my heart like stoped for 2 seconds and my heartbeat was all over the place...I do have good heart doctors here in Coimbra (huge public hospital with top-notch specialists) and free care....still I missed a couple of appointments to investigate further. I will get a Darwin award one of these days...
(Yes I do still smoke 2 packs a day but heat sticks now without burning and without Tar, and yes I do not get out of my house now consecutive for 9 months in a row. I do not exercise more than going from my bed to my PC chair, to the Kitchen or the bathroom...)
I spend my time mostly seeing lectures debates documentaries and playing some games on the web since I am retired due to my 90% vision loss