Welcome to FDMB!
A couple of thoughts. I'd call wherever. you ordered your meter and see if you can return it since it's unopened. If not, we have a forum called,
"Supply Closet." You can see if someone would want to purchase it from you. Some vets have a hissy fit fi you don't use a pet meter. (Somehow, they seem to have forgotten that meters calibrated for animals are a relatively new innovation. Most of. us have used human meters.)
You may want to take a look at this post from the Lantus/Basaglar/Levemir forum regarding
dosing strategies. Because Lantus is a depot insulin, how you change doses is different than with other, shorter acting insulins. The sticky note that I linked provides you with two different dosing methods -- Tight Regulation (TR) and Start Low Go Slow (SLGS). Ultimately, you will need to decide which approach works best for you. TR has published research supporting it's use and has a history of getting newly diagnosed cats into remission. SLGS was developed here and in use before TR and has been used with good results. Once you start testing and have a spreadsheet set up, you may want to post on the
Lantus forum. There are additional sticky notes at the top of that board that will help you to. understand how Lantus works.
You have a wealth of choices when it comes to food. There is nothing magical about "prescription" foods. (In fact, the FDA is cracking down on pet food companies for calling their food "prescription" diets.) What's key is that you feed your cat a low carbohydrate diet. We consider less than 10% to be low carb (LC) -- although most people tend to feed their cat around 5% or so. Lisa Pierson, DVM has put together a wonderful website on
feline nutrition. She has a
chart that lists the carb content and other nutritional information that is very helpful. For what your spending on DM, you can be buying a much higher quality food with human grade ingredients. The so-called prescription foods do not contain great ingredients. There is no reason to buy those foods -- my cat, for one, refused to eat DM. She did just fine on foods from Dr. Lisa's list although I did have to have a discussion with my vet when I returned all of the prescription stuff that I was able to feed my cat a lower carb diet than what she was recommending.
Also, I hear less about fat diabetic cats than skinny cats with FD. The way diabetes works, the food your cat is eating, once metabolized into glucose, isn't getting into the cells in order to provide energy. Instead, it's floating around in your kitty's blood stream (hence the term "blood glucose"). Insulin is what helps to transport the glucose into the cells. If your cat's pancreas isn't producing enough glucose to get the insulin where it belongs, your cat's BG numbers will be high. Your cat will also be starving -- literally. The other issue is your kitty was living on the streets. A good meal was likely not all that easy to find.