I'm 24 year old male. 8 days ago I was playing football and got hit by an elbow in the right side of my chest, knocking me to the floor and winding me for a few seconds. Ever since this happened I've been getting chest pain from my right side. It hurts in the same place when I cough, get up after sitting down, and when I lay on my back and breathe out, but not in. Can you help, please?