I think I'm having a heart attack.

Meaning

I suspect I'm experiencing a cardiac event.

Examples

• John: '<b>I think I'm having a heart attack.</b> I'm experiencing chest pain and shortness of breath.'<br>
• Alice: 'I'm calling 911 immediately.'
• John: 'Stay calm and I'll call for an ambulance.'
• Alice: '<b>I think I'm having a heart attack.</b> My left arm is numb.'<br>