Hi Doctor, I Think I Suffered From Perfomance Anxiety. Whenever

Hi doctor, i think i suffered from perfomance anxiety. Whenever it's my turn to present i'll get really nervous and my hand will start shaking. My heart starts to thumping like non stop. Even though i already prepare my presentation, everything will disappear from my mind. I don't mind if the shaking is not severe, but it does and it bothers me a lot. What medicine should i take?