Fear of heart attack. A more treatment!

From last 3 month I m suffering from fear of heart attack, one day my pulse rate go up, at the same time I done echo, it was normal only pulse rate is high, In 3 month I done 8 ecg all are normal, some time I feel chest pain and left side body pain, I consult the cardiologist, dr says there is no any heart problems, for clearity done echo test it's a normal, I consult with 3 cardiologist all says there is no any problem but still some time I have a same problem left side body pain, and minor chest pain, For clearity done tmt test, it's a also negative, Dr। Says u have a anxiety problem, May met score is 13.4 I have no any problem in body like blood pressure, and all body report are normal, only cholesterol minor boder line high Pls suggest I should leave worry or take a more treatment