Hello, My Name Is Maddy And I'm 17. A Couple

Hello, my name is Maddy and I'm 17. A couple hours ago I started getting really bad chest pains out of the blue. My chest feels very tight when I exhale and I have shortness of breath. I know I have bad anxiety and stress problems but I've never had this happen. It can't be anxiety because it's lasted for over two hours and it feels like something could be wrong. The pain will last for a few seconds and then go away. It really hurts when I try laughing or coughing. It hurts the most when my breathe out.