I had undergone an angioplasty and stent after i had a mild heart attack in aug 2007. why long should i feel low energy level.?

Not this long.: If the angioplasty and stenting were successful and it was truly a minor mi, you should have your strength back by now. You may be de-conditioned or there is some degree of heart failure following the mi or another unrelated cause for your lack of energy. Please follow up with your cardiologist!

Not related to heart: Energy level, fatigue etc is not usually a symptom of a blocked heart artery. More likely related to depression or anxiety. You should notice symptoms related to activity or exertion if a heart artery is blocked.