Medical scare

Well. I was driving down I-20 in Alabama today. When suddenly, my chest begins to hurt. I figured it was heart burn so i didnt pay any attention to it. That is, until the pain grew more intense as well as started creeping down my left arm and to my neck. I pulled into a rest area, just passed exit 40, and called 911. within 20 minutes they had an ambulance rushing me to the local hospital because my readings indicated the beginning of a heart attack. Luckily, my results came back negative. But I'm still worried about it.