Selena Gomez performed at Billboard's 'American Music Awards' on Sunday night, which was her first performance in over two years! It's now being revealed that she suffered a panic attack right before hitting the stage, which may of been the cause for her somewhat 'shaky' performance. Selena has been through so much in the last few years, and it's only natural for her to feel nervous before her first big performance. I think the song is an emotional one for her as well, so I'm sure that contributed to the anxious feelings.
We love you Selena! You're so beautiful and talented - keep shining!