What Causes Chest Pain Along With Difficulty Breathing?

Hi my name is Patrick im 22 years of age I have asthma for the past while iv been getting sharp pains in my chest it takes my breath away it has become more frequent my heart beats so hard I can feel it throughout my body and have been getting pains in my left shoulder and back I have constant heartburn no matter what I eat or drink heart problems run in my fathers side of the family he died at a young age from a heart attack in his sleep my doctor has checked my heart and cant find a problem