I've been having strange pains in my back and arm. I developed a huge knot in my back and it caused severe pain in my upper back and shot through my right arm to my elbow. I went to the doctor and they diagnosed it as a sprain but i think they were wrong its still agonizing. Also my mother passed away about 5 months ago and I've been suffering with the lose could these strange pains be a part of depression? Thank you for your help.