Acute Pancreatitis: This condition is characterized by inflammation of the pancreas, which can cause vomiting, diarrhea, and elevated amylase levels due to the release of pancreatic enzymes into the bloodstream. The symptoms and lab findings align closely with acute pancreatitis.

Gastroenteritis: Although primarily associated with vomiting and diarrhea, some cases of gastroenteritis can lead to elevated amylase, possibly due to the involvement of the pancreas or salivary glands in the inflammatory process.
Mesenteric Ischemia: This condition involves reduced blood flow to the intestines and can cause abdominal pain, vomiting, and diarrhea. Elevated amylase might be seen due to the involvement of the pancreas or intestinal injury.

Intestinal Obstruction: While not typically associated with elevated amylase, an intestinal obstruction can cause severe vomiting and diarrhea. If the obstruction involves the ampulla of Vater, it could lead to elevated amylase levels. Missing this diagnosis could lead to severe complications, including bowel ischemia.
Diabetic Ketoacidosis (DKA): DKA can present with vomiting and abdominal pain, and elevated amylase might be seen, especially if there's associated pancreatitis. DKA is a medical emergency requiring prompt treatment.

Zollinger-Ellison Syndrome: A rare condition characterized by excessive gastric acid production due to a gastrin-secreting tumor, which can lead to diarrhea and potentially elevated amylase if the pancreas is involved.
Eclampsia: In pregnant women, eclampsia can cause vomiting and diarrhea, and although rare, it might be associated with elevated amylase levels due to the systemic nature of the condition. Given its severity and the risk to both mother and fetus, it's essential to consider in the appropriate clinical context.