A 55-year-old lady with diabetes, hypertension, and UTI, came with a history of vomiting for 1 week which had increased in the previous two days. She was listless, dehydrated, BP was 100/60. She was admitted and her initial reports were: Hb 11.7, TC 10100, creatinine 7.3, urea 114, K+ 3.17, urine showed pus cells .

ABG pH 7.32, pCO2 16, pO2 164, HCO3 8.2, BE -17.9 RBS 157. What is the diagnosis and treatment?