Someone please help me, please...i think i am having an anxiety attack?

i have this terrible fear of throwing up...like i freak out..my stomach has been hurting me all day, i have been feeling nasuase but i have had enough energy to go out and rehearse with my band and go to my school picnic and hang out with my friends after school i havn't really ate anything today, but now since its late out i'm beging to freak out..i think im going to throw up but my mom says im not going too...like i gagged before like what you do right before you vomit but i held it in...my breathing is fast and i feel very night headed...my heart rate is very high too...i am also shaking..and my hands are tingling...do you think im going to throw up? i've been also burping alot...someone please help me ...please