Hi Feline! Take a deep breath! If you do have fibro, there are two trigger/tender points above the breast, exactly where you are descibing your pain. When you are stressed they will be sore to the touch and can ache, burn, sting or stab and the pain will radiate. I am having the same issues with the tender points in my butt muscles, hips, knees and shoulders right now and I know how painful and disturbing it can be. So many of our symptoms mimic other serious health disorders but once you understand how this disease manifests, you will calm down. I think it's just the muscle in your chest.