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My name is ***** ***** I have been a Vet tech for 30+ years with special interest in Exotics and small animals. I suspect that Brodie may have had a drop in glucose levels leaving him lethargic. This would make sense if he has Insulinoma. You may have to syringe feed. You can try balancing the glucose by taking a,little Karo Syrup and rubbing it on the Gums. Once he responds a bit try feeding him. If he does not respond and want to eat, we need to go to syringe feeding. He cannot go without food. With insuinoma food needs to be going in. You can read about the Insulinoma glucose drop in this article and repeats what I just suggested: http://miamiferret.org/insulinoma.htm
It is important to balance the glucose levels and get Brodie eating on his own again.
Checking in to see if you tried the syrup and if it seemed to help. If he has not started eating again I suggest syringe feeding with food.