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Hello, I am Dr. Pulter. I am a small animal veterinarian. I can help with your kitty today.
Low blood sugar can cause a pet to behave abnormally. Cats in an agitated state can bite as result of not being able to control what is going on.
What is your cat's name? Is he eating and drinking normally? Going to the bathroom normally?
Of course. It is distressing when a pet acts out of the ordinary. Cat's tend to stress easily and it is possible that the stress has upset his diabetic regulation.
Cat's can also go into remission spontaneously and may not need insulin at all! So as you can see cats are fickle. What I would do is call your regular vet for advise about your cat's insulin dose as soon as you can (I know holiday weekend) as they will know your cat better than I. In the mean time if he act's strange like this again if you can get a glucose reading that would be best so you can give that information to your vet and give some syrup if it is low. I cannot comment on if you should stop insulin or change doses as I don't have an exam on your cat. If you are very worried i would try to seek emergency veterinary care during one of these times in case he needs medical intervention.
A low blood sugar can cause a lot of different weird things to happen. I wouldn't be surprised if a patient lost their sight for a little while. They can also act disturbed, or very lethargic or have seizures which is the most concerning. I am sorry about your kitty and I hope he does well. let me know if there is anything else I can help you with.