I'm a 40yr old male, 180lbs, non-smoker, non-drink, no drug use, no other health issues.
About once a month (for the past year) I get these attacks/episodes with hypertension 150/100+, shivering, and sternum/stomach pain. Sometimes I will also get tachycardia, cold hand/feet, severe dizziness, blurred vision, and exhaustion.