I am sorry to hear about your symptoms, and I can certainly understand why they are concerning. It is not possible to provide an accurate diagnosis for your symptoms without taking a thorough medical history and performing a full medical exam. I strongly encourage you to schedule an appointment with a primary care doctor
to help further evaluate your symptoms.
The pain you are experiencing could be musculoskeletal. The muscles controlling your shoulders, arms, and back are used frequently during the course of the day. Overuse, awkward sleep positioning, and anxiety
can lead to muscle tension and spasm, which can be quite painful. Electrolyte abnormalities and dehydration can contribute to muscle spasms. Additionally, you may have suffered an injury
to one of the muscles, bones, or areas of cartilaginous connection in this area, all of which can be painful. You will need to undergo an evaluation by a primary care doctor to help determine if you need any additional testing.
Another possible explanation for your symptoms is an aortic dissection, or tear in the wall of the main blood vessel exiting your heart. This often causes tearing pain between the shoulder blades and is a life threatening condition. You will need to discuss this possibility with a primary care doctor.