Imagine this: you’re home alone, maybe it’s late at night, and everything seems normal. Suddenly, a strange pain hits your chest. At first, you brush it off as just fatigue. But then, the pain intensifies, you start sweating profusely, and the discomfort radiates to your left arm and neck. You feel short of breath, and your heart races. It dawns on you: you might be having a heart attack, and you’re all alone. What do you do?