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 sudden collapse, severe breathing difficulty, or persistent chest pain.
Family members may also benefit from learning cardiopulmonary resuscitation, or CPR, when a household member has a significant risk of dangerous heart rhythms.
Contact the care team sooner for declining exercise ability, more swelling, new palpitations, fainting, or worsening breathlessness.
Cardiomyopathy usually requires ongoing follow-up, even when symptoms are mild.
Routine visits may include a symptom review, physical examination, ECG, heart imaging, rhythm monitoring, or blood tests.
The timing depends on the type of cardiomyopathy, treatment, and whether findings are stable.
Routine follow-up is appropriate for stable symptoms and planned monitoring.
The article also says
Keep a current medicine list and tell the care team about side effects, missed doses, supplements, or nonprescription medicines.
Do not stop heart medicine suddenly unless a clinician advises it.
Ask whether first-degree relatives—parents, siblings, or children—should have heart screening.
Screening may involve an ECG and echocardiogram, with genetic counseling when appropriate.
A normal test at one point may not end the need for future screening in families with inherited disease.
Every sign above is quoted from the sofidex article on Cardiomyopathy. If you are not sure, err upward — it is always reasonable to be checked.