My wife has high blood pressure. She also frequently has indigestion due to a medication she's taking. When she's experiencing indigestion and heartburn, she often thinks that she has a heart ache which worries her. The anxiety also causes her to have heart palpitations. When she's worried or stressed, she can even make her blood pressure rise.
The only way to calm her down is to give her an anti-acid medication. The blood pressure medications she's on already protect her from heart attacks and I remind her about that. When the heartburn is gone, she's fine.
It's easy to get carried away by thinking about the symptoms we're experiencing but like the article said, it doesn't necessarily mean that there is a serious issue.