Shocking story, what kind of a situation am I in?

Good luck

 

I think you need a copy of your consent form. In surgery especailly when they are unsure what they find when they open you up there is usually a catch all clause, so if they find something that needs removing, like you have a an operation for cancer they will take out any lymph nodes or biopsy them in the same operation. They would justify it was it was in your best interests especially if your pancreas was necrotic, and likely to be a source of infection, its very unlikely they would remove healthy tissue.
Before you go through the cost of a legal case I would think what would it atchieve, and how it could make your situation any better. If you have lost confidence in your medical team perhaps its just better to see another one and get a new GP who has a good diabetes team.
In the UK you can now access hospital blood and scan results on line and should recieve a copy of your discharge letter with a summary of any treatment.
I agree they should have told you but I work on the basis I live on the fuction I have, and I am glad I am not one of the 25% that die from it.
I was told that pancretitis ages your pancreas by 10 years, which is very simplistic, but its does give some sort of context of why is you get repeat bouts your function may deteriorate.