You can potentially die from heart palpitations if the heart palpitations are caused by other issues such as heart disease, heart attack that is about to come on etc.
Some people experience heart palpitations when they are having a panic attack or suffering from anxiety as well and in those cases the heart palpitations are usually not serious and are not gonna kill you.
When your anxiety or panic attack goes away then the heart palpitations should also go away.
But if you have heart disease, have had a heart attack, stroke etc or the heart palpitations get worse or are very frequent then you should go to the doctor or emergency room just to be safe.
The hospital or doctor can find out what the heart palpitations are being caused by.