it's best to speak with your folks and make an appointment with a doctor. there's really no way to tell what's at the root of these episodes without having answers to questions such as past fainting spells previous heart surgeries heart murmurs etc a physical exam blood tests and imaging of your heart can help pinpoint the cause. your age would make one wrongfully assume this is not serious. yet heart diseases such as valvular problems congenital heart disease pathology causing irregular heart beats can and do occur in young people. these and other conditions that cause palpitations should be addressed. and if you've had fainting episodes in the past you should be evaluated early. if you really think it could be serious you must go to the doctor. however when i have anxiety or have a panic attack it feels sort of like you described. i would talk to your loved ones and consider going to a doctor. i hope you feel better.
i have palpations and i get minor chest pains with it but i'm 15. is this serious?