Did he vomit immediately after eating? Some cats do what we call a "scarf and barf", where they get so excited and eat the food so quickly that they puke it right back up. Bandit is one of these. Do you think that could be the problem? If so, you can fix it by feeding smaller, more frequent amounts of food. I can't give Bandit more than 1.5oz of food at a time (1/4 of a regular sized can, or 1/2 of a small can), or he'll barf it right back up.
The other possibility is that you implemented the diet change too quickly and it upset his stomach a little. If that's the case, some
http://www.amazon.com/Purina-Veterinary-FortiFlora-Nutritional-Supplement/dp/B002CM7BOC/ref=sr_1_2?ie=UTF8&qid=1333378856&sr=8-2 might help. You can pick some up at any vet's office--some will sell it by the packet, some might make you get the whole box. The upset should resolve itself in a week or so if diet change is the culprit.
Nausea is also a common side effect of glipizide, so it could also be his medication. I know I've already said this, but it is just not a good medication to be giving to your cat, and it's likely to do permanent damage to his pancreas. I saw in your other thread where you asked about the cost of insulin therapy--it's really not so bad when you consider that it's likely going to be a temporary cost instead of a permanent one if you start right away. The only extra cost for a cat in remission is a couple of test strips a month.
I'm not sure about the cost of Levemir, but Lantus is going to be about $90-$120 for a 10 ml vial, or about $230-$250 for a pack of 5 3 ml pens. If you use this
$25 off coupon for Lantus, the pens are $219 at Walmart. That seems more expensive than the vial, but it's actually more economical. The 10 ml vial will go bad before you can use all of it, but you'll use every drop of the pens so there is no waste. With proper handling, the insulin will stay good for 2-6 months, so that pack of 5 pens will likely last you a year or more. You also have the option of ordering insulin from Canada, where it is way cheaper. Here are some links where you can order it:
https://docs.google.com/document/pub?id=1FCnrPxpYD02Gp5hWtEIbhLXm0VOyaZlAT_qeCjlx-Js&pli=1. Syringes (.3cc, 30-31g with 5/16" needles and half unit markings) cost about $15 at Walmart.
Apart from insulin, the only other real expense is test strips. Walmart's Relion Confirm is a popular meter that has inexpensive test strips. This is the same meter but without the Walmart brand, and the test strips are even less expensive if ordered through ADW:
http://www.americandiabeteswholesal...ose-monitoring-kit_4044.htm?source=SiteSearch. You want to budget for about 30 test strips a week.
I would get the meter and start testing immediately. You'll want several days of testing after you stop the glipizide but before you start insulin--right now you don't know if the diet change is what lowered his blood glucose or if the glipizide is doing it. If he is reaching normal/almost normal levels without it, then you may not even have to start insulin.
Like I said, I know this seems like a big expense, but you really have to look at the big picture--delaying treatment is more likely to lead to permanent insulin dependance and bigger vet costs with possible diabetes related complications.
EDIT: Just saw your other post and that you got a meter and started testing! That's fantastic.
