Anxiety Issues. Help?

My mother does not believe I have anxiety issues. I am very well like at school and everything, except today I had the most embarring thing ever happen to me! In Orchestra we had a playing test (we all individually had to play a song in front of everybody). It was my turn I honestly was not nervous and I started to shake and then I kept stopping, and starting shaking really badly. Teacher said I was excused I started crying and hyperventilating and everybody started to laugh at me. I am popular so everybody was talking about me that day and made fun of me. I now have tons of new rude nicknames. What can i do to prevent it from happening again? I was mortified!