Clinical deterioration of a patient with a history of acute pancreatitis

Acute clinical deterioration of a hospitalised 59-year-old patient with a history of acute pancreatitis (toxo-nutritional etiology), presenting with severe epigastric abdominal pain in and overall prostration. What are your first steps?
59
years
man
RR
22 /min
HR
107 /min
SpO2
93 %
BP
92/51 (65) mmHg
temperature
37 °C
CRT
3 s