Hello! I have carefully gone through your problem & would like to advice regarding two aspects -
1) The first & most important thing is that you absolutely need not worry because you have had already undergone the best possible treatment, the CABG.
2) The symptoms of post CABG chest pain
are common & can be managed effectively with the advice of your cardiovascular surgeon & you are advised thereby to have a routine appointment with him.
Thanks & take care of yourselves!