Hemorrhage: This is a common and serious complication following pancreatectomy. Hypotension in this context could be due to significant blood loss, leading to decreased intravascular volume and subsequently decreased peripheral vascular resistance. The febrile state could be indicative of an infectious process or a reaction to the hemorrhage.

Sepsis: Post-operative infections can lead to sepsis, characterized by an increase in vascular/capillary permeability due to the inflammatory response. This results in hypotension, fever, and potentially other signs of organ dysfunction.
Pancreatic Fistula: A complication of pancreatectomy, pancreatic fistula can lead to fluid loss and electrolyte imbalances, contributing to hypotension through decreased peripheral vascular resistance.
Acute Pancreatitis: Post-operative pancreatitis can cause hypotension through a combination of mechanisms, including increased vascular permeability and systemic inflammatory response.

Myocardial Infarction: Although less common in the immediate post-operative period, myocardial infarction can occur, especially in patients with pre-existing cardiovascular disease. It would lead to hypotension due to decreased cardiac output.
Pulmonary Embolism: A significant and potentially life-threatening condition that can cause hypotension through decreased cardiac output and increased pulmonary vascular resistance.
Adrenal Insufficiency: Rarely, adrenal insufficiency can occur post-operatively, especially if the patient had pre-existing adrenal dysfunction. It leads to hypotension due to decreased peripheral vascular resistance.

Anaphylaxis: A severe, life-threatening allergic reaction that can cause hypotension through increased vascular/capillary permeability and decreased peripheral vascular resistance.
Abdominal Compartment Syndrome: Increased intra-abdominal pressure can lead to decreased venous return, resulting in hypotension. This is a rare but serious condition that requires prompt recognition and intervention.