I guess your wife was experiencing gallstone pancreatitis after removal of gallbladder, cause the gall stones have blocked the pancreatic duct.
Symptoms are pain felt in the left upper abdomen or in the back, with nausea and vomiting, similar to symptoms of Gallstones and Gallstone Disease.
Blood tests identify inflammation of the pancreas with increased levels of amylase and lipase, and evidence of obstructed outflow of bile from the liver with ALT, AST, alkaline phosphatase and bilirubin, also, raised.
Another thing, is a condition known as Sphincter of Oddi Dysfunction, that usually, develops after the gallbladder has been removed.
The sphincter of Oddi muscle is a small circular muscle, located at the downstream end of the bile duct and pancreas duct, keeping the bile duct and pancreatic duct muscles closed.
If this muscle should spasm or scar due to previous surgery, drainage of the bile duct and/or pancreas duct may be hindered.
This leads to abnormal widening of the bile duct and/or pancreas duct, often associated with an increase in the products and enzymes made by the liver, gallbladder and pancreas.
Symptoms are episodic, and consist of abdominal pain, nausea and vomiting.
Sometimes angina, or heart muscle blood luck can mimic this pain.
That's why your wife was made a stress test.
Does your wife have high blood pressure and elevated cholesterol blood levels?