2ndDivisionVet, you’re doing the right thing. I was in the same situation two years ago, numbers not exactly the same but pretty close. I got mine down with a low carb diet, a few supplements and dropped 35 pounds in just a few months.
The only thing I can see that I did was some supplements to get me jump started. It took a few months to get things to the normal range. I didn’t start exercising until after I lost the weight. There is a good fiber supplement that also helps. Investigate glycemic load concepts as well. That is how much a particular food can spike your blood glucose. If you need any help with advice I could probably help you. I decide what kind of things to eat based on the glycemic load, or how much of a portion size to eat.
I want to help, will pray. Have hope. I know what you are doing can be successful.
There is a lot of good advice from some of the comments to you, about fish oil and omega3. One more thing, the thing that got my morning glucose reading down for the first time was a diet from a book called Mastering Leptin by Byron Richardson. He also has a blog with information.
He talks about spacing meals apart and not eating snacks between meals. This helps your pancreas function as it should and allows it to have some rest time between meals. The book explains it. When I first started on his diet, my numbers dropped down right away and have stayed down consistently. Amazon carries the book. Best of luck to you, and your wife.