I'm a 36 year old male. I'm 5'10" tall and have a semi-sedimentary lifestyle. Yesterday I got a pressure along my sternum. This pressure went away, but has since reemerged as pain, particularly when breathing (in certain positions) and swallowing food. I also, at the same time, noticed a pain in my upper back (on the right side of my spine). Beyond that I have had clear mucus for some time now. I stopped taking allergy meds about 1 month ago and my breathing has stayed fairly clear. The only other symptom I notice (which has been around for some time) is a bit of fatigue. Any thoughts? Thanks so much in advance