I suffered serious anxiety and panic for a couple of years. Called 911 several times, thinking it was a heart attack. My wife, who is a doctor, humored me through these episodes, though she knew what was going on. One day, as I came to her again and proclaimed I was having a heart attack, she said, "You know, if you're standing up, you're pink, and you're telling me you're having a heart attack, you're probably not (having one)." That calmed me down. Over the next year, I learned to "fix" my anxiety, and now only rarely feel a wave of panic coming on, and even then, can get it under control.