Today i had crazy palpitations for 10seconds i was scared my heart would stop beating now i have a headache and a little chest pain what could this be?

Cardiac symptoms: When palpitations (the sensation of a rapid or irregular heart beat) are associated with lightheadedness, fainting, shortness of breath or chest pain, they should be evaluated promptly. While most kinds of heart disease are less in young people than in older people, there are several conditions which affect children or young adults and which could cause these symptoms.