Hi,
Your doctor seems right, as all these tests done for your heart do not show any abnormality. Therefore, it is more likely that, this pain may be just
anxiety related symptoms. Also, this type of pain may be just due to postural / positional defects. Hence, try to improve your, sitting, lying & standing postures.
Physiotherapy for maintaining good postures may be helpful.
Taking some tranquillizer and OTC analgesics for a short period under guidance of your doctor may help to resolve, your problem. However, if the problem persists or symptoms become more intense, even after these measures, then you are advised to consult an orthopedist for possible diagnosis and treatment accordingly.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Satnarain Bansal, General & Family Physician