"Angina condition occurs when the coronary arteries become constricted and are not able to carry sufficient oxygen to the heart muscle"
That is what I am talking about. Yes, angina occurs in many people when the heart is not getting enough blood. And a heart attack is when the blood/oxygen drops to the point or long enough that the muscle starts to die. This is what is so confusing. Angina is but one of many symptoms of a heart attack or one on the way. So lets say we have a person with every symptom of a oxygen starved heart except for angina. Common sense says they too should take Nitro to get oxygen to the heart just like us. It's just that their symtoms are different than those who have angina. The internet and doctors make a good list that we can agree covers about 99% of the people with heart problems, yet when it comes to the list of reasons to take Nitro, it is down to 1 symptom.
I never take Nitro for the pain as the pain is very low level and more of a strange sensation. I take Nitro because the pain is like you say, an indication of a blood & oxygen starved heart that if left that way may start having muscle die (AKA MI or Heart Attack). And for me, I see the shortness of breath go away.
I think it is time to bug my doctor.
BTW - I rode again today and it is much hotter. Much better than Tue. when *&%$ hit the fan. I keep reminding my self that is not an all clear for the heart. It tends to throw you some good days to cover up problems too. Lol!