If your anterior infarction
was old then there is not a thing that could be done. It's over, in the past, happened who knows when. That is why they did not seem to concerned. Although you should have further tests run on this matter.
The T wave
is the heart as it repolarizes, (rebuilds energy) for the next beat. There are many things that can cause abnormailities in the T wave. So unless I could actually see the ecg I would not be able to give a resonable opinion.