After 4 weeks, I was diagnosed with an acute pulmonary thrombo-embolism. I did not have the typical symptoms, but pain started after I breathed in 'CS' gas during an accidental discharge. I also had pertussis earlier in the year. My pain always started btw the scapulas, and as my respiration increased from very mild exercise, the pain radiated across my scapulas, to my chest, down my arms to my elbows, and across my lower jaw. I never had problems breathing; only the pain. The pain would shortly stop after I stopped whatever I was doing, to include walking. I also have mild degenerative cervical vertebrae. My heart was thoroughly examined and all is well. My doctor prescribed an anti-coagulant, which after two days has lowered the pain, but my doctor insists the pain is not caused by the embolism. I know the type of pain I have from the cervical vertebrae, and what I have is not the same. Any idea what is a possible cause of the pain?