Help, i keep crying in school!?

by the way, this is a girl using matthew Vern's account. i'm his friend and he lets me ask questions on YA. any way, when the end of class comes and we have a few more minutes until the bell, i start getting so horribly nervous. my heart races and my hands shake and get cold and i don't know what to do. i start breathing fast and deeply and then feel like i might pass out from hyperventilating and i don't even know when it started. i've also started randomly hysterically crying thinking about missing my friends even though it doesn't make me that sad. i think about how i feel like im mentally ill and i feel really shitty and just bawl. i see a counselor outside of school and she has just begun to address the anxiety but i cant take medicine because my dad wont let me. do i have a mental problem?