I have had upper back pain under right shoulder present one year but not at rest. this week has shifted to left. i do have fast pulse 116. and cervical sstenosis. could this be my heart?

Doubtful: It is doubtful that this is heart related. However, you women have strange heart symptoms and should be included in your workup as well as chest x-ray. My experience in this type of pain, it is usually related to "tightness" around the suprascapular nerve and of the rhomboid muscles attachng to the shoulder blade. I usually will block the suprascapular nerve and trigger point inject the muscle.

Possibly: Its important to establish a diagnosis. It could be from 1) referred sources including: neck, abdomen, and heart. 2) shoulder sources include: arthritis, labral tears, instability, tendinitis, rotator cuff tears, bursitis, painful bony spurs etc. Therefore proper diagnosis is essential to stopping the pain. See an orthopedic surgeon.