A 42year old female presents with diazepam and alcohol overdose. She is comatose. Temperature is 34.5degC. BP is 100/80 mmHg. Creatinine is 2.4mg/dL, AST -500, GGT- 35 IU. Urine dipstick showed 3+ for blood but urine analysis was normal. USG abdomen was normal. What is the most likely diagnosis?