I m a 19 year old male, 6 2 and 175 lbs. for the last 3 days I ve been experiencing sudden, sharp pain in the center of my chest, behind the breatbone, that radiates to my lower neck. I know it is definitely my heart. It only lasts a few seconds, and then goes away, leaving me with horrible anxiety. It happens here and there, but always intense, stabbing pain.