Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have severe pain in shoulder and arm after placing stent . Well there can be many reasons for symptoms you mention in query like muscle spasm , cervical spondylosis, TMJ problem , nerve compression , ear infection or heart problem like angina . For now stay calm , take ibuprofen , apply warm compresses to shoulder and arm , do light stretching exercises under expert or acetaminophen for pain and take proper rest. But in your case the symptoms can also occur due to post surgery complication , so also consult your cardiologist . Doctor may also refer you to dentist for TMJ problem . For now eat light and soft , sleep in correct posture and try to reduce your stress level , as such pain can also occur due to stress, keep yur posture right while working , do stretching exercises for shoulder neck and back under expert . I would suggest you to consult orthopedic surgeon for proper examination and treatment . Doctor may order CT scan , MRI along with nerve conduction test and physical examination to confirm the diagnosis . Doctor may prescribe muscle relaxant , anti inflammatory , nerve supplement along with physical therapy . In some cases doctor may recommend acupuncture . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari