YOU AREN'T GOING TO DIE. REPEAT, YOU AREN'T GOING TO DIE.
Brush it off as growing pains for now, which it probably is. If it gets REALLY BAD then I would start to call your doctors, etc.
crushing chest pains, pains radiating in the left arm, or jaw pain, vomiting,shortness of breath are sign of a heart attack.
It may be heart palpitations..I have had this for a while now..if there's no pain in your arms or numbness..then it may be the palpitations..I suggest you to google it because im still learning about it..hope this helped!
I often have occasional pains in my stomach or around the heart reigion too, if you get easily stressed out ortense it maybe the sighn of an ulsar, in which case you need a doctor to look throughly through that posibility, or it may simply be heartburn, dunno just my word