Doctor, I don?t even a single percent sure that my heart is working properly becaucse major problems what im facing is when I was shouting very loud and was very angry suddenly. I started feeling uncomfortable on my left chest and heart started beating fast and I realize that is something very serious. I tried to calm my self but even without such event also. I feel discomfort in my left chest in past gone through heart test as well those include tmt ecg echo etc. all were fine, I am being diagnosed with high blood pressure and i'm having medicine for that as well. Really feel very much uneasiness on my left chest and sometimes head as well. please help me out seriously.