Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help for chest discomfort that is new, severe, occurs at rest, does not settle as expected, or comes with fainting, marked breathlessness, sweating, nausea, or pain spreading to the arm, jaw, shoulder, or back.
And for anyone, someone who:
Arrange a prompt medical review if angina becomes more frequent, lasts longer, feels different, or begins with less effort than before.
Routine follow-up helps assess symptom control, medicine effects, blood pressure, cholesterol, diabetes management, and progress with lifestyle changes.
Tell the clinician if symptoms interfere with usual activities, if you are using fast-acting nitroglycerin more often, or if medicine causes dizziness, headaches, bleeding, or other concerns.
Do not stop heart medicines without discussing it with the prescriber.
These changes are not part of routine follow-up.
The article also says
Keep an up-to-date medicine list and know the action plan for chest symptoms.
It can be useful to record when symptoms occur, what you were doing, how long they lasted, and what relieved them.
Every sign above is quoted from the sofidex article on Angina. If you are not sure, err upward — it is always reasonable to be checked.