Friend rushed to hospital for what I thought was a heart attack?

Me and my friend were with a group of friends—about twelve of us. One of my friends come over and suddenly puts his hand in his chest and says he cannot breathe… so i rushed him to a hospital even a police officer stopped me but I had the emergence light and said my friend is in need of medication attention. So the officer escorted my friend to the emergency room. I find out later that my friend only had anxiety attack. I was somewhat angry but glad that he made it. Angry at the fact that I didn’t know it was something this simple… come on anxiety? I thought he was having a heart attack.