Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Emergency care is needed for fainting, confusion, inability to drink, severe weakness, little or no urine, rapid breathing, or other signs of severe dehydration or shock.
Seek prompt medical reassessment if diarrhea continues, vomiting prevents drinking, urine remains reduced, or symptoms return after initial improvement.
Routine follow-up may include reviewing hydration, nutrition, kidney function, or electrolyte levels, especially after severe illness or hospitalization.
A clinician may also discuss when it is safe to return to food handling, healthcare, childcare, or other work covered by local public health rules.
The article also says
A person who improves with treatment should continue replacing fluid losses until diarrhea stops.
Normal feeding should restart as tolerated.
Weakness and thirst should steadily improve, and urine should become more regular.
Household members do not usually need preventive antibiotics.
They should watch for diarrhea, follow careful hand hygiene, and use safe food and water.
Public health officials may recommend additional measures during an outbreak.
Every sign above is quoted from the sofidex article on Cholera. If you are not sure, err upward — it is always reasonable to be checked.