Since about last summer I have been having an extremely sharp pain in my chest whenever I do any running. I am in good health and have been fit my whole life. I have seen numerous specialists all who keep sending me elsewhere. I have been tested for athsma which came back negative, for spasms in my bronceal tube which came back negative, I have had an eco done which showed that my heart was perfectly fine, I have had x-rays which have indicated nothing aswell. Also they have tried giving me a puffer that did absolutly nothing and but me on singular which only made me extremely dizzy and full of headachs. I am working to become a police officer and need to maintain a high level of fitness which is being extremely affected by the pain in my chest. The pain is located just on the outside of the sternum directly between two of my ribs on both sides. I'm not exactly sure which number of ribs it is that the pain lies in between but it is above my chest bu slightly bellow my neck. It is the same spot on both sides and feels like someone is hitting me with a knife. If i stop running it lasts for 20 mins ruffly before it goes away. It is definatly worse in the cold but is pretty painful at any temperature.
PLEASE HELP