I am sorry to hear about your dad being sick. First of all it depends on what type of obstruction, small bowel versus large bowel (colon
) obstruction. Risk factors for small bowel obstruction include history prior abdominal surgeries and interventions as your father had.
If they discharged your father home without any surgery it's because small bowel obstructions can be partial, and they can resolve on their own or with the aid of a nasogastric tube, however there is a chance of relapse. Your concerns are real, and if your father starts vomiting
again, his belly gets distended and can't keep any liquids or food down then he should go back to the hospital. If it's a large bowel obstruction, it's a whole different story but he is more likely to require surgery to fix whichever is the problem.