What Causes Pain In Chest Associated With Sharp Burning Pain In Upper Back?

yes, i was in the e.r room 2 days ago but left after several hours of waiting and tests for this chest pain i have been having associated with sharp burning pain in upper back. I left before seeing the dr. and getting treatment. I just got a copy of chest xray results from medical records and found out i have hyperinflated lungs with coarse opacities within each lung base. Should i go back to hospital and get treatment and how serious is this