Okay, I don't know why in the world a vet would give A/D for pancreatitis but I would be having a fit...
That is 30% fat. A normal dog food is maybe 14-20% fat and the goal is to LOWER fat intake. They could've made it worse by feeding that.
A radiograph might show something. Maybe try an ultrasound if you are that concerned. I don't think this can go on though. Even if these cases are mild they can turn severe. What foods were you giving when this happened? I have given stuff I shouldn't have too. Don't be too hard on yourself.
Did they do a blood panel?
Veggies aren't going to aggrevate it. You are safe with those.