Hello doctor I have palpitations one day and I took ecg it showed sinus tachycardia one day and I did 2d echo test and it was normal. A week later I took another ecg it was normal. Right now I'm using betablockers (betacap tr 20mg ) in the morning and nexito plus in the night. But what scares me is sometimes I'm feeling a weird sensation like some pressure is coming from head to neck and pulsing like palpitations. Like my heart is stopping and beating..what is the cause for this? I'm worried very much is this anything heart related? Pls help me.