A 52-year-old man with a 10-year history of well-controlled essential hypertension on amlodipine 5 mg daily presents with acute-onset severe headache, chest discomfort, and dyspnea. On examination, BP is 210/130 mmHg, heart rate 110/min, respiratory rate 28/min, and bilateral crackles on lung auscultation. ECG shows left ventricular hypertrophy with strain pattern. Chest X-ray shows bilateral pulmonary edema. Serum creatinine is 2.8 mg/dL (baseline 1.0), and urinalysis shows 3+ proteinuria with RBC casts. What is the most likely diagnosis?