One of the most frightening symptoms of panic and anxiety are palpitations and tachycardia, at least in my case. Since I suffer from this that every once in a while my heart rate goes over 100bpm up to 140bpm. Sometimes I don't feel it, but when I do, it's awful. I've complained about this symptom to every doctor I have seen - general practioners, psychiatrists, neurologists, gastroenterologists, cardiologists. Yet, no one ever prescribed me a beta-blocker to abort tachycardic rythms. Could it be because my ECGs and holters have normal tracings and the tachycardias I have - at least at the time the exams are done - are sinus tachycardias? Should I insist with my doctors to prescribe me a beta-blocker to take as a SOS medicine when I get palpitations or high heart rates at rest? What's your opinion? Thanks!