For past 2 days, I am experiencing pain in my chest and upper back (right side below the shoulder blade). When I wake up in the morning, pain is in the upper back but after staying for a while or walking, the pain in upper back vanishes. Then I feel pain when I breathe deeply. I feel I'm out of breath after 10-15 minutes and when I breathe deeply I feel chest pain. I doubt it is because of gas because of the way pain moves from back to chest and then again the same cycle next morning.