Electric pressure like sensation. Out.

Hello doctor I suddenly got a lower back head pulsating pressure accompanied with palpitation and I consulted a doctor..he checked my bp on that day it was 160/90. He told it was hypertension. So he prescribed some medicines. A week later I'm normal. And when I checked my bp twice after that it was 120/80. But my lower back head pulsating pressure was persistent. After few days I got panic for some reason and suddenly one day I got palpitation. So Doctor told to do ecg and it showed sinus tachycardia with 148bpm heart rate. Also I done 2d echo and it was normal. And again doctor prescribed some medicines. And a week later Again I done with ecg and it was normal . now no more palpitations but, sometimes I'm feeling an electric pressure like sensation in my back of neck and somewhere in the chest but it was weird sensation I'm not able to explain.. and also I have anxiety..is this anything related to heart I'm worried pls help me out.