I'm so so sorry to hear of the loss of Yogi.
Tink has had pancreatitis issues for about 3 years (she is 11 now). Due to the recurrance, she was put on prescription diet (low fat). As long as she does not get a hold of anything she is not supposed to - she does fine. I have to be super careful that I never drop even a crumb of food anywhere. But, when treating for pancreatitis, it usually involves fluids, antibiotics, and anti nausea medications.
She was sadly diagnosed with pancreatic cancer in November. I have not seen where there is any correlation between pancreatitis and Insulinoma (her cancer), but it does make me wonder...
It seems like your vet is saying he passed not from the pancreatitis, but from an underlying issue (blood clot to his heart, or had a heart arrhythmia)? But you did absolutely everything you could, and took him to the vet immediately.
Again, I'm so so sorry for your loss.
