Today I was sitting my math class, listening to what my teacher was saying. I started day dreaming a bit because I was really uninterested in the topic, and I was bored. Suddenly, my heart started beating really fast and my hands become sweaty. I started feeling really nervous and restless, and I wasn't even sure what I was nervous about. I went to the bathroom and just kinda sat there for a moment, taking some breaths. I wasn't nervous before that, and from what I know I wasn't worrying about anything. Does this happen to anyone else or is there something wrong with me?