A 70-year-old male with a 6-year history of hypertension (HTN) suddenly developed headache, agitation, hyperhidrosis, and pallor upon waking this morning. Blood pressure (BP) was 250/125 mmHg, heart rate 125 bpm with regular rhythm. Bilateral lungs exhibited medium and fine crackles with scattered wheezes. Liver and spleen were non-palpable, and no lower limb edema was present. What is the most appropriate diagnosis?