I went on a run 2 days ago and it s starting about 2 hours after my run I started having pain in the center of my lower chest area. Almost high abdomen. Right behind my zyphoid process. And it hurts when i breathe deep Or about 1.5 seconds after i swallow food. Almost like as it goes down towards the stomach i get a sharp pain
Chest pain after running classically related with heart.  Chest pain related with heart will not be sharp pain.  It is like squeezing type and more over inside the chest and associated with sweating. Sometimes radiating to neck shoulder. If your age crossed 35-40, and smoker, hypertension and diabetes, Any family history of heart attack, definitely requires investigations. Other possibilities may be acidity or rectus muscle pain. TMT test clearly rules out your heart problem o f it is there.