im having real bad pains on the left side of my chest and left shoulder blade area.it hurts really bad when i cough or sneeze and sometimes when i take a deep breath.sometimes when i push on my cest or take a deep breath it makes a crunching popping sound.i went to the emergency room and was checked to make sure it wasnt heart related and the dr. told me it wasnt.can you please tell me what might be causing this?it has been ging on for a month now.its hard to get comfortable at night and when i have my left arm in certain positions the pain increases.