My father has just undergone angioplasty (ballooning) 3 months ago. Since then, he has been complaining that he has a stinging pain and a burning sensation under his left chest area. He went back to the hospital twice with the doctors saying that nothing is wrong with him, his heart is okay and they are unsure of the cause themselves.He has been holding the pain for 3 months now. What is this pain and how can it be treated? Is it heartburn? Is it because of his medication? (Plavix and Aspirin) Please help! Thanks a million!