Reversible ischaemia means during exercise some parts of the heart muscle are not getting the blood supply it needs. This is shown by changes in the EKG (ST segment depression
). This is usually due to a narrowing in a coronary artery
. You experienced some angina
with this. You got tired and breathless at a fairly low workload so there does seem to be a problem. I am sure whoever organised the treamill test will be arranging further tests, probably an angiogram. This sort of problem can usually be fixed but it does sound as though you will need further treatment.