High blood pressure accompanied by dizziness is a serious symptom that requires immediate professional medical evaluation rather than self-medication. Dizziness can indicate dangerously high blood pressure, a sudden blood pressure drop, or other underlying complications. Consult a doctor, as the correct treatment depends on your medical history and current vital signs. Taking the wrong drug could worsen your condition. Please sit or lie down safely to prevent falls, and seek urgent medical attention or visit the nearest emergency department immediately to have your blood pressure safely evaluated and managed.