What symptoms led Helen Campbell to seek emergency care?

Helen Campbell sought emergency care primarily due to experiencing nausea and vomiting for three days. This symptomatology indicates a significant and prolonged gastrointestinal issue that could lead to dehydration, electrolyte imbalances, or other complications if not addressed promptly. The duration of the nausea and vomiting suggests a serious underlying condition that requires further evaluation in an emergency setting.

While the other options present potential concerns that also warrant medical attention, they do not reflect the specific combination of severity and duration seen in case B. For instance, severe headaches and blurred vision can be indicative of various conditions, such as migraines or increased intracranial pressure, but may not necessarily compel someone to seek emergency help unless associated with other alarming symptoms. Similarly, fever and rash could suggest an infection, which is serious, but the immediate need for hydration and evaluation of prolonged gastrointestinal distress makes option B the most pressing reason for Helen's visit to the emergency department. Chest pain and shortness of breath are critical symptoms that would trigger immediate attention, but the specific emphasis on prolonged nausea and vomiting is what distinguishes option B as the primary cause for Helen seeking care.