A 48-year-old woman from Bangalore is admitted with a 5-day history of tremor, hallucinations (seeing insects crawling on her skin), autonomic instability (BP 160/100 mmHg, HR 118 bpm), and confusion. She has been drinking 12 units of alcohol daily for 20 years and stopped abruptly 4 days ago after her husband's ultimatum. On examination, she is disoriented to time and place, diaphoretic, and febrile (38.5°C). What is the most likely diagnosis?