Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Use emergency services for chest discomfort suggestive of another ACS event, severe breathing difficulty, fainting, or sudden symptoms of stroke.
And for anyone, someone who:
Call the treating clinician promptly for increasing shortness of breath, new swelling, rapid weight gain, worsening fatigue, medication problems, or recurring mild symptoms.
Do not wait for a routine appointment in those situations.
And for anyone, someone who:
Follow-up after ACS is part of treatment, not an optional extra.
Before discharge, the care team should explain the diagnosis, medicines, activity plan, wound care if a catheter procedure was performed, and symptoms that require help.
Routine follow-up may address blood pressure, cholesterol, blood sugar, tobacco use, nutrition, physical activity, sleep, mood, return to work, driving, and sexual activity.
The clinician may order follow-up blood tests or heart imaging based on the event and treatment.
The article also says
Take prescribed medicines exactly as directed.
Do not stop an antiplatelet medicine without speaking with the clinician managing the heart condition.
Stopping it too soon after a stent can allow a dangerous clot to form inside the stent.
Report unusual bleeding, black stools, blood in urine, severe bruising, or difficulty taking the medicine.
Cardiac rehabilitation is a supervised program that combines exercise, education, risk-factor management, and emotional support.
It can help people return safely to activity and build habits that protect the heart.
Every sign above is quoted from the sofidex article on Acute coronary syndrome. If you are not sure, err upward — it is always reasonable to be checked.