Oh! Dear..........you are in a pickle Dee.
Your ECG showed ischaemic changes eh?
Well, the first thing that the Cardiologist will do is to confirm that they are indeed ischaemic changes and not variants of a normal heart, as not all doctors can read or interpret ECG changes.
Let us assume that the changes are due to ischaemic, then the commonest cause by far is coronary artery disease and this may well need investigating by coronary angiograms and if they show impaired coronary blood flow, then you may be offered bypass surgery.
I do not know your medical history in detail or what drugs if any, that you are taking and those facts may be essential.
The surgical treatment of ischaemic heart disease is " bread and butter " stuff today.
Yes, be nervous and even scared, but be reassured.