<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been feeling nauseous for the past few days. What could be causing it?  <response>: You might be suffering from Choledocholithiasis, which is the presence of gallstones in the common bile duct. Other symptoms include abdominal pain, vomiting, and jaundice. It would be best to run some tests to confirm the diagnosis. 