I had right side upper chest pain on Sunday that lasted from 6 am in the morning until the afternoon. I rested, took a nap and it went away. The pain was mild, not severe. It hurt a little more when I pressed on it and it would also hurt when I breathed in deeply. I ve also some pain in both of my ribs. Ever since Sunday afternoon, there hasn t really been any pain except only when I press on my right chest. Last night though, I was lying on my back and it felt a little hard to breathe. Felt as though I was breathing to slowly and felt as though I had to take deep breaths a lot. It went back to normal though, but it made me very nervous. Not sure if it was just anxiety or something more serious.