Raj,
Since coronary artery bypass graft (CABG) is the most common type of open heart surgery, your long-duration post surgery pain is quite unusual. Since you've tried so many other solutions, you may want to consider these two options:
A. Keep a diary of the incidences of chest pain including date, time of day and any unusual upper body exercise or physical stress.
B. Schedule a follow up consult with your surgeon to review the diary for any unique patterns or other physiological conditions.
Best of luck,
Vic
Victor Fabry, Founder
Greylock Advisors, LLC
Healed Hearts of New Jersey