I have severe chest pain, slightly to the left of my sternum. The pain is not associated with any activity such as eating or physical exertion. The pain usually lasts 15-30 minutes and is a sharp, stabbing, pain. The pain is so intense I actually have to concentrate on breathing and being very still until it goes away. The pain will go away on its own without treatment. The last 2 occasions which happened within one week, occurred while I was sitting. After the first event I went to the ER and my EKG, Cardiac enzymes, CXR, CT of head and chest were all negative. I take no medications on a routine basis. I have no health problems.