I have been experiencing a lot of pain in right shoulder, neck, and shoulder. The pain runs down my entire right  arm. This has been going on for several months now. I just noticed a small hard lump on my clavicle bone. When I apply pressure to this lump the pain shoots into my shoulder up my neck and into my scapula. I have also been experiencing fatigue and periods of breathing issues as well as an annoying itching under my chest. Should I be concerned?