If echo is normal then seems to be valves are okay in their functioning. Now ecg shows irregular heartbeat and you have tachycardia
(increased heart rate
) and angina/ ischimic heart pain. You might have some ischemic cardiac condition like myo cardial infarction. could also be a case of myo carditis. your height and body weight are an essential components to a proper assessment. Now blood cholesterol
level, density of blood (thickness) and complete blood picture (CBP) are some essential hematology investigation are required. You have to undergo cardiac angiography
(non invasive investigation procedure to know the percentage of blokage in the coronary artery/ blood supply to heart). If indicated then cardiac angioplasty
is to be performed.....
All these things to be done under the supervision of a certified Cardiologist only.
Wish you a healthy heart soon..