Anxiety. Yikes.

I had my first day of school today and everything went amazingly!
However, it's the second day of my period and for some reason I've randomly been hit with anxiety. You know, the type you get when you do something super embarrassing and you think people are making fun of you but you know you have to go back and face them the next day.
But I don't think anything like that happened today, atleast from what I can remember. Does this happen to you too?