Your Positive TMT shows you could have coronary artery
disease and you have been treated with medication for it. It is always better to have an angiogram, to see the severity of coronary vessel involvement and decide on whether angioplasty
or bypass or medication. If you are not conviced with angiogram, atleast try to get 64 slice CT angiogram that is non invasive. Your heart problem can definitly be treated.