Hey..i need help with something and when ever i asked it the answer hasnt help so can u help me PLEASE! please?

Hey my name is Mackenzie im 12 and i need help. Well i was in school i sat down and then my heart started beating really fast i got real warm i got dizzy i had a funny feeling then my stomach hurt. And thats been happening to me fro about 4 days..do u know what that means! PLEASE HELP!! [=