Feed him more protein fewer carbs it will help Stableize his sugar and bring numbers down check out Keto diets he won't understand shots and insulin might make his blood sugar drop protein breaks down slower and doesn't make sugar go up like carbs and sugars do good luck I am diabetic too and eating Keto works great for me. Check cooking Keto with Kristy or reversing diabetes the information is great

I would get a second opinion. Usually meds are tried before insulin. Ask the doctor. Also ask interactions with other meds he may be having.diet can help. Discuss being late term, what doctors would recommend. Your current doctor should have been more help.

Diabetic specialist is an Endocrinologist. They will let you know what to do as far as med an insulin. My hubby is insulin type 2 diabetic since '99. He to was on meds at first. But when our son was diagnosed as type 1 we learned a lot more on how to manage diabetes. My husband is now on a insulin pump (yeah no shots) and also now uses a CGM unit from Dexcom G6. These not only helps him but lets us now how his sugars are doing. Let us know how it goes. Hope the Holidays are great!

Yes - testing for A1C is always done fasting. Hope you’re able to find a doc who specializes in geriatrics. Good luck.