You don't say how old you are?
Palpitations can be caused by stress
, caffeine, exercise etc. However, the fact that you say you are also suffering from chest pain
, shortness of breath
is more worrying. There should be a Dr standing in for your own, I would suggest you make an appointment. If you are unable to see a Dr soon, go to the Emergency Department as you ought to have an ECG and blood tests done to rule out anything which needs to be treated.