Hello doctor few months back I got palpitations.and doctor told to take ecg it showed sinus tachycardia.and I also did 2d echo test it was normal. Later I done 2 times ecg it showed normal. My lupo profile is normal.bp also normal. Blood test also normal. But recently I got hypothyroidism.and I'm using thyroid tablest now. But from many months when I got palipitations from then I'm feeling a weird sensation like some palipitations sometimes and also pulsing in neck and somewhere in my chest but it's strange to explain.im using metaprolol tablest also. But sometimes I'm feeling that pulsation in neck and lower back of my head. What is the cause? I'm scared and I'm worried. Pls help me.