When should I consider seeking emergency medical care for high blood pressure, particularly if I am experiencing symptoms that are potentially alarming? Is there a specific threshold that categorically necessitates immediate intervention, and how do I distinguish between routine hypertension management and a situation that demands urgent attention? For instance, what are the telltale signs or accompanying symptoms—such as severe headaches, vision changes, or chest pain—that might indicate an impending crisis? How can I ascertain whether my elevated blood pressure readings might precipitate a more serious condition, such as a hypertensive emergency or even a stroke? Additionally, if I have a history of cardiovascular issues or other relevant comorbidities, does that heighten the urgency for me to visit the emergency room? What protocols do medical professionals follow to triage patients presenting with elevated blood pressure levels, and how can I best prepare for a possible ER visit should the situation arise?