Extreme pain when swallowing?

The other week I just got over pneumonia. I took the medicine and everything was fine. Now after about a week after I have got over it I am experiencing a extreme pain in the esophagus on the right side of my chest. When I swallow it feels like someone is stabbing me in the chest. And when I take deep breaths it also does the same thing. It just started today. I'm a 15 year old male. Do I need to go to the hospital? Doctor? Please help.