Have you undergone EkG?
Any family history of cardiac disease?
Do you have numbness in arms?
Are you suffering from anxiety?
Chest pain along with dyspnoea, has to be checked for cardiac disease. Though physically , all lab work are normal , but cardiac checkup is also very neceesary.These symptoms can also be due anxiety.
Other reason may be Costochondritis.It is an inflammation of the cartilage that joins the ribs to the chest bone. It is this inflammation that causes the sharp chest pains inside the chest wall
IF EKG is normal , then you need not to worry much.Take painkiller Tyelnol .
Hope it helps.