I know that is easier said than done. I have really bad anxiety and my stress can sky rocket at the littlest things. And when I get stressed I either shut down or go into a complete frenzy. I'll clean and organize everything in site, or just get in bed and sleep for hours. Neither one of those methods are effective ways to handle the stress I'm facing. It's an escape from the problem, and you'll just end up coming across it again in the future if you don't sit down and solve it. The main thing with stress is that you're focused on one small detail most of the time, all you really have to do is take a step back and realize things aren't really that bad and that you're going to be fine. It may not feel that way right in that moment but they will be eventually because they always are.
When it comes to stress your biggest enemy is yourself. You psych yourself out and get top wrapped up in the constant jumble of thoughts coursing through your brain. So take a deep breath and tell your self that your ok. That you can make it through it. That one bad test grade doesn't determine your worth as a person. And that fight with your best friend? She was probably just stressed out top.
The best advice I can give you in regards dealing with stress and anxiety is to make sure you don't project it onto anyone else. Being rude to the people around you won't change that jittery feeling you have. It will just make you feel even worse. So go for a run, eat a bowl of ice cream, read a book, take a bubble bath and calm your mind because that's where that stress is located. In your own head.