An esophageal perforation is a hole in the esophagus, the tube through which food passes from the mouth to the stomach:
http://www.medhelp.org/medical-information/show/4253/Esophageal-perforation
Take care !!
First and foremost - pain. Also chest pain, difficulty swallowing and breathing, low blood pressure, fever ... an esophageal tear can be fatal if you don't have it taken care of - see a doctor immediately.