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 care for a new seizure, confusion, difficulty waking, breathing trouble, collapse, a rapidly spreading non-fading rash, or a sudden return of severe meningitis symptoms.
Contact the care team sooner for persistent fever, worsening headaches, new hearing or vision changes, increasing weakness, repeated vomiting, or a decline in normal activities.
And for anyone, someone who:
Follow-up after hospital discharge checks for complications that may not be obvious during the acute illness.
The care plan depends on the person's age, illness severity, and recovery.
These symptoms should generally improve, but they are appropriate to discuss during routine follow-up, especially if they affect school, work, mobility, or self-care.
Follow-up may also include reviewing meningococcal vaccination status and checking for an underlying risk factor.
Further immune-system testing may be considered after repeated meningococcal infections or when the clinical history suggests a complement disorder or spleen problem.
Keep routine appointments for hearing tests, rehabilitation, vaccination review, and neurological or developmental assessment.
The article also says
A hearing assessment is usually arranged because meningitis can damage hearing even when no problem is noticed at first.
Children may need developmental, learning, or behavioral review.
Adults may need assessment of memory, concentration, balance, work capacity, or daily functioning.
Recovery can take time.
Fatigue, headaches, reduced stamina, sleep changes, and difficulty concentrating may continue after the infection has cleared.
Every sign above is quoted from the sofidex article on Meningococcal meningitis. If you are not sure, err upward — it is always reasonable to be checked.