I just got over a clot in the lung about 2 month ago my heart beats hard and fast when i walk my upper chest is tight and my throat have little pain?

You need evaluation: You got lung clot possibly because you we're on the contraceptive pills. Other rare causes are problems with hypercoagulopathy because of familial problems with hemoglobin. You need to be evaluated again if you are symptomatic . Meanwhile you need: 1) avoid smoking. 2) avoid any contraceptive and hormone therapy.3) avoid standing or sitting for a long period of time without moving your legs.