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Chemicals like adrenaline, alcohol, caffeine, cocaine, amphetamines, and other drugs all cause palpitations. See if you take more of any---usually coffee and alcohol is the culprit. Disease (such as hyperthyroidism and pheochromocytoma) or mitral stenosis, panic disorder all cause palpitations. Hyperthyroidism has been ruled out in your case.
Panic disorders can canuse a number of physical symptoms such as upper back/shoulder pain and chest pain. The pain in upper back/shoulder can also be due to stress on muscles, pinched cervical spinal nerves and/ or wrong posture.
Palpitations may be associated with heart problems (which can cause chest pain), anemias and low blood pressure. A 12 lead EKG should be done.
If you have cough and are taking medicines that contain asthalin or terbutaline then the palpitations can be a side effect of the drugs. Cough can also cause pain in upper back/shoulder and chest pain. Since a confirmed diagnosis cannot be given on net please discuss these possibilities with your doctor once. Hope this helps. Take care!
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