Welcome to FDMB.
As much as I hate to say it, being overwhelmed at first is a part of this process. We've had vets, vet techs, and medical professionals of all sorts who have been members of this board and everyone is initially overwhelmed. You clearly care a great deal about your kitty -- enough that you did your research and found us -- so of course this hits like a ton of bricks! This is a very supportive community and we're here to help. This is the best place you never wanted to be.
In reading your initial post, my first thought was that of course your vet's impression is that remission only rarely occurs. The vet is giving you less than wonderful information! When my cat was first diagnosed and hospitalized at an emergency vet clinic, she was prescribed Novolin. When I was back to see my regular vet who was feline specialist, she immediately changed the insulin. Her comment was, "Novolin is a great insulin for dogs. It's lousy for cats." That was in 2009. Since then, the
American Animal Hospital Assn has published guidelines for the treatment of diabetes. Since 2018, they no longer recommend Novolin. The insulins they recommend are Lantus (or now, one of the generics/biosimilars) or Prozinc. I've linked their guidelines if you want to read through or share with your vet.
I agree with Bron. Starting a dose of 3.0u is a huge dose. It's also worrisome that your vet recommended such a large dose and discouraged you from home testing. We're huge proponents of home testing as it gives you control over what's happening with your cat and keeps your cat safe. It's even more concerning that between a whopping dose of insulin and no encouragement to home test, it sounds like your vet is unavailable on weekends. That leaves you in a position of having to spend a lot of dollars if you need to go to an emergency vet if your cat's numbers drop very low. You do NOT need your vet's permission to home test. We have tons of information on
home testing.
We all realize that we're asking you to take a leap of faith and trust what could easily be a group of crazy cat people on the internet. This board had been here for over 25 years. We have been tracking some of the cats that have gone into remission. On the Lantus forum alone, we have over 500 cats that have gone into remission since 2008. No doubt we've missed some but this is an impressive track record. That list doesn't include cats that are well regulated -- it's only the cats that no longer need insulin. The research on the use of Lantus in newly diagnosed cats supports what we've seen and is not in line with what your vet told you. In fact, both the AAHA and the research on Lantus supports home testing and a low carbohydrate diet and that remission is possible.
The food your vet recommended, despite telling you it's a "high quality" food is not. Prescription diabetic food has no ingredients that are meant to treat diabetes. (In fact, the pet manufacturers lost a class action suit for erroneously calling their food "prescription.") As an example, these are the first several ingredients in the Royal Canin dry food: Chicken by-product meal, barley, wheat gluten, corn gluten meal, soy protein isolate, tapioca, powdered cellulose, chicken fat, natural flavors, dried chicory root, fish oil". Barley is high in carbs. Powdered cellulose is another name for sawdust. There are a great deal of fillers included and chicken by-products are not muscle meat. The dry Glycobalance is over 30% carbohydrate. A low carb cat food is less than 10% carb. The Glycobalance canned food is low in carbs (around 4.5%) but the ingredients are questionable (Water Sufficient For Processing, Chicken Liver, Chicken, Pork Liver, Pork By-Products, Chicken By-Products, Powdered Cellulose, Pork Plasma, Gelatin, Modified Corn Starch, Wheat Flour). If you want to learn more about feline nutrition, this is a
link to a wonderful website authored by a vet.
I would not suggest getting rid of the dry food unless you lower the insulin dose. I don't mean to scare you but there is a very good chance that the only thing that is preventing a hypoglycemic episode is that you are feeding your cat a high carb food.
We are truly here to help. Please let us know if you have questions.