Welcome to you and Miel!
It is really tough in the early days but, as Carl said above, it does get better the more you learn and also as you find things that help you to manage better. On that note, if you haven't already been there, I suggest checking out Dr Lisa Pierson's site,
http://catinfo.org. You'll find great tips there to help Miel to transition to wet food (e.g. sprinkling parmesan or Fortiflora onto the wet food). To help you with feeding while you're at work, a timed feeder is great. A popular model with the members here (and one that's very robust/burgle-proof) is the Petsafe 5. What dry food is Miel eating at the moment? If push comes to shove, there is a dry food called Young Again Zero Carb that might be another interim solution. It does contain a small amount of carbs, but nothing as much as the regular / prescription dry diets. As you're no doubt aware, any food transition should be done very gradually to avoid both hypos and digestive upsets. If you look on the Feline Health Links board here you'll find a thread that explains how to calculate the carb content of foods. With regard to wet foods, many members here feed their cats from the Friskies Paté and Fancy Feast ranges (some of them are higher in carbs, so you need to check individual flavours for suitability). I believe that they are relatively inexpensive foods.
With Vetsulin, the blood glucose can drop quite hard and fast in the early part of the cycle so it's important that Miel has enough food at the start of the cycle for the insulin to work on, otherwise there's a risk of hypos. As you learn to home test and gather data, you'll be able to learn Miel's pattern of response to the Vetsulin. If you are shopping around for vets, as Carl suggests above it is well worth asking whether they use more cat-friendly insulins (e.g. Lantus, Levemir, Prozinc), and there is scientific evidence that they may increase the possibility of remission in newly diagnosed cats compared to the likes of Vetsulin (although remission is also possible on Vetsulin). WRT things you're not sure about that the vet has suggested, the members here have a wealth of experience of living with feline diabetes 24-7 so post your questions on the main Feline Health board to get help and suggestions about your options.
Hang in there. You're not alone with this, and you've found a good place to get help with managing Miel's diabetes.
