Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services now if the person has:
Emergency care is different: it is needed for impaired awareness, seizures, breathing difficulty, collapse, or severe heart symptoms.
And for anyone, someone who:
Contact a local poison information service promptly if Myristica oil has been swallowed.
Do not wait for symptoms, because effects may be delayed.
This is especially important for a child, an intentional exposure, an unknown amount, or a product with unclear ingredients.
Seek urgent advice for persistent eye pain, vision changes, worsening cough, shortness of breath, or symptoms that begin or worsen after the person initially seemed well.
Routine follow-up is reasonable when symptoms are steadily improving but have not fully resolved, or when the healthcare team has requested repeat checks.
The article also says
While waiting for help, do not make the person vomit.
Keep the container available.
If the person is drowsy but breathing, place them on their side if it is safe to do so, and do not give anything by mouth.
Every sign above is quoted from the sofidex article on Myristica oil poisoning. If you are not sure, err upward — it is always reasonable to be checked.