Palpitations (which come and go) are usually "prematre contractions" and do not carry much significance when associated with a normal heart on ECHO. However we must demonstrate that palpitations are indeed "premature contractions only" by doing an ECG at that time or by holter monitoring.
For chest pain
, most important fact is if it is related to exertion/ running/ using stairs/ carrying weight or not. Further work -up will depend on the clinical judgement only. However for an anginal pain to be ruled out you have to have a stress test
(if that is a possibility after clinical evaluation).
One clinical condition which can be associated with both these at such a young age is "mitral valve prolapse" but that should have been picked on ECHO.
Discuss with your doctor in light of above facts. Mean while avoid smoking
, tea, coffee and alcohol as they all increase palpitations.