thanks for writing to us.
this is although not the complete description of your problem , but still not normal by any means.
many a times a simple gastritis
can have palpitation
, nausea, dizziness
, and sharp pain
in lower chest. At times cardiac problems can have all these features, but these are mere speculations. you need to have an examination by your GP with detailed history, so that the actual basis of problem could be understood and further action can be decided.
feel free to write further with more details