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Hello and thanks for trusting me to help you and Moonie today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
Those are very concerning signs in a diabetic cat. When was the last time he had his blood glucose checked?
What diet do you usually feed him? Has he been maintaining his weight?
How is his water intake?
What is the name of the food you are feeding?
When you say his water intake hasn't changed, is he drinking a lot? How many ounces (or cups) per day would you estimate?
Thank you for all of the replies to my questions. His behavior may or may not be related to his diabetic state, but is very concerning. Type I diabetic cats usually do not do well without insulin and with diet only changes. It is more the overweight type 2 diabetics that will respond to low carb diets and achieve better glycemic control when you limit their carbs. If he is a type I diabetic, there is less chance for his pancreas to start producing insulin on it's own again.
So, that is the first thing I would worry about. On top of that, if a diabetic, we have to worry about the possibility of ketoacidosis, which is a more severe condition that can progress rapidly if not identified and treated.
For that reason, I would recommend that you seek emergency services this evening.
Of course, there are certainly other metabolic disturbances as well as GI distubances that can occur and can lead to symptoms such as you describe, and it is impossible to know without an exam and bloodwork tonight which he may have, but since some are considered life threatening, it would be best not to wait.
Pope Francis is a lover of animals, so we can hope for some divine intervention to aid your search tonight. Please keep me posted as to how things progress.