I really don't how to explain this or where to start but anyways. I've been feeling like I've pulled something in my back around the shoulder, when I use my arm it feels strange around my armpit and sometimes I feel pain down my arm. It sometimes goes up to my neck. It has been like this for at least two weeks, can you please help me?
I recommend that you see Two , a Cardiologist just in case the symptoms are coming from your heart. Orthopedic that specializes in the cervical spine. Cervical spine refers into the shoulder blade, and this could be the source of your pain or it could be symptoms of your heart muscle Thats where I would start.
Without doing a physical exam or getting more information, I am unable to give you a diagnosis. Please see your doctor.
If there has been no trauma it is most likely a out of place rib head or muscles cramping. I would try a massage or chiropractor first.