Hi: Out of the blue, my shoulder began to hurt me three days ago. Since then, the pain spread to my neck, chest, and forearm. My range of motion is limited and yesterday I noticed a huge black and blue bruise on my forearm and upper arm. I am concerned because I have not done anything out of the ordinary. I have not experienced any trauma, have not had an accident, or done any excessive lifting, pushing, pulling of any kind. I also have a mild headache. Kindly advise. And thanks so very much! Rebecca