After being treated for a pulmonary embolism 10 days I started getting intense pain(#10) in my back on the eighth day; pain is more intense when I take a deep breath or try to breathe heavier as my respiration goes up when I move around/walk. I've started coughing up clear mucus again however; sometimes there is brown blood (dry or old blood?). I went back to the ER and they took an xray & treated me for the pain; they didn't see anything just told me it could be from inflammation.