Hi @erodla. I started out on Atenolol 20mg several years ago, then switched to Carvedilol 25+25mg on advice from my nephrologist. I don't recall having any reactions to the switch, but that may be from A-fib that is almost asymptomatic. But I'm confident that Carvedilol supresses my blood pressure, and that's positive because of my fundamental problem of hypertension. I am surprised by your heart going "crazy . . .so badly both fysical and physical," not something I have experienced. But I'd suggest a serious conversation with your medical team on whether your reaction was caused by your medication or your heart's dysfunction. Martin