I have a pain in my front shoulder/armpit area, then travels through my bicep, to my forearm. It feels like it s either on the bone or in the muscle. I m not sure what caused it, but it has been around painfully for 3 months. I am a diabetic type 2 taking insulin and medicine, age 56. I wondered if that had anything to do with it or could it be a form of fibromyalgia? Should I get an x-ray, pt scan, or what? Thank you for your advice.