Margarita, 60-year-old female with a history of coronary artery disease presents to the emergency department with severe chest pain, shortness of breath, and sweating. She has a history of hypertension and is currently on medications to manage her condition. On examination, the patient is anxious hypotensive (BP 80/60 mmHg, tachycardic (HR 110 bpm), and has a weak, thready pulse. Her skin is cool and clammy, and her breathing is shallow. She appears pale and has decreased urine output. Based on the patient's presentation, what type of shock is the patient most likely experiencing, and what stage of shock is she in?