Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services or go to an emergency department for trouble breathing, chest pain, fainting, vomiting blood, black or bloody stool, severe or rapidly worsening abdominal pain, or a hard and very swollen abdomen.
Contact your surgical team promptly for a fever, increasing redness or drainage from an incision, worsening pain, repeated vomiting, persistent diarrhea, difficulty eating or drinking, or symptoms that are not improving as expected.
Seek urgent medical assessment if you cannot keep fluids down, have signs of dehydration such as very little urine or marked dizziness, or develop new abdominal swelling with worsening pain.
Routine questions about diet, wound care, work, and planned medicine changes can usually wait for office hours or your scheduled follow-up.
Every sign above is quoted from the sofidex article on Pyloroplasty. If you are not sure, err upward — it is always reasonable to be checked.