Student passed out on PE doing fitness gram, was having abnormal breathing and not responding. Called 911, operator gave instructions to do CPR and just did it, 3 mins, not stopping. Other people around me were freaking out, no one wanted to take over, so I kept going. EMTs came, took it over, student was fine after a while. She has done this before, basically anxiety/panic attacks, and parents are trying to find the cause of it. She went home, and was fine after all issue, talking and smiling. People were telling me good job, and was said I was very calm doing the issue, but in all honestly, I was trying to keep it together while everyone is panicking and I know I'll freak out later at home.