<prompt>  A 28-year-old man comes to the emergency department because of a severe headache, palpitations, excessive sweating, chest pain, visual disturbances, dyspnea. paresthesias, constipation, and a sense of impending doom over the past 2 weeks. These symptoms occur primarily at night. His blood pressure is 13080 mmHg while supine and 9060 mmHg while standing; his blood sugar is 240 mgdL. Which of the following is the most likely diagnosis?Alcohol withdrawalFamilial dysautonomiaOpiate withdrawalPheochromocytoma 