I had a flu and coughed a lot since a week ago, productive cough. I coughed less and less everyday and now the cough is almost completely gone. However, last night I felt mild pressure on my chest no matter how I would lay down, the pressure would not impair my breathing at all but it just felt like discomfort. After a few hours since I woke up, the pressure in my chest is still there and I also have a new symptom: a pain in the upper part of my back, when I breathe in. I do not feel the pain if I breathe into the lower part of the lungs, you know the stomach kind of breathing, only when I inhale into the upper chest. I am a bit scared of this, so I wanned to ask everyone, what could this be? Should I be concerned? Is this yet another panic attack symptom?