I'm being investigated for probable angina. Usually it is exercise-related, but yesterday I was under a lot of stress at work and I had the same heaviness, radiating slightly to my jaw, but lasting for about half an hour, when I used GTN and it eased temporarily. My BP was 157/100 at the time.

My GP said I should be concerned if it lasts over 10 minutes, but the stress was on-going. Do I need to worry?