If you have a similar situation again, and have a large bag of veges or maybe a chicken in the freezer, open the fridge and place the cold thing on the top shelf, the insulin on the middle shelf, remove anything you might need to use in the next few hours then close the door gently and leave it shut.
The frozen item will cool the air right down - hence not putting the insulin in the lowest part of the fridge, and should keep it down overnight.