Hi, you are doing great so far. I'm glad that you got a meter and are starting to test. Knowing what the BG reading is is essential before giving insulin. It is also essential for you peace of mind. No parent would ever inject their child without knowing what the BG is. Why should we do so w/ our furbabies? Zoey will get used to testing and her ears will learn to bleed for you. Be sure to give rewards every time you test, whether you get a good sample or not. Many of our cats will purr through the whole process because they know they are going to get a treat. Try taking an old sock and put about 1/4 cup of uncooked rice in it and microwave it for about 20 seconds depending on your microwave. Use that to warm the ear and give support from behind when you prick. ALWAYS put pressure on the test site for 20 seconds after to stop the bleeding and any bruising.
It's nice to see that Zoe is coming down, but that could be from the carbs wearing off, that was a lot of Karo, we usually only give a few drops. The effects of Karo can wear off quite suddenlly. The preshot reading could also be a bounce from going too low earlier. The liver will sense low BG (or lower than it is used to) and dump glucagon and counter regulatory hormones into the blood to protect against hypo. Eventually it will learn what normal is again.
Giving half the insulin twice a day is a very good idea. Vetsulin is an "in and out' insulin, it doesn't have a long duration. Cats have a much higher metabolism and usually need insulin twice a day. The 40 on your syringe is because Vetsulin is a U40 insulin, there are 40 "units" of insulin per cc, so the syringes are always marked for the type of insulin. The measurements on the barrel are different for other insulins.
Those test results are hard to read, it looks like her potassium is low and her phosphorus? Low potassium can definitely show as muscle weakness. It also says "UTI'" hand written. Was she also dx w/ a urinary infection?
It's also quite a list of meds you were given;
Vetsulin - really a better insulin for dogs than for cats
baytril - anti biotic, for the UTI??? UTI can be infection or inflammation from crystals. Were bacteria found? If so, what type?
Methigel - for urinary ph, covering all bases in case it's crystals, but Ph was normal? Were crystals seen in the urine?
carafate - is used for ulcers
metronidazole - this is for diarrhea! and Zoey was in for constipation ?????????
Laxatone - for constipation (or hairballs) but it is really high in sugars, 3 of the first 6 ingredients are syrups, not good for diabetes!
I've put in links for you to check out for most of the drugs. Get used to researching and double checking everything.
You seem to be familiar w/
Dr. Lisa's site. She has a great list of most of the cat foods and their carb content. Ideally you want to feed foods that are less than 10% calories from carbs. Check out her nutrition page and you will want all your cats on canned food. Yes, it's more expensive, but a lot less than the vet bill for the conditions that dry food causes or aggravates.