It's mindblowing, I know... I was so scared and confused when first diagnosed, and so lost. There's so much to take in, and so much advice is conflicting. First off: it will be okay. It doesn't feel like it right now, but you will be. That i can give you right off: a bit of hope that this is something you can and will get a grip on.
So here's a LOT of information that you don't have to remember all in one go. Just come back to it later, or take notes or whatever. It's a lot to learn, and I'll try to keep it simple, but it's still a lot. If you feel like it, get the books by Dr. Jason Fung: he's really good in explaining stuff and making you feel better and more in control.
As a T2, you're insulin resistant. That means you can't process glucose out of your body efficiently, and practically all carbohydrates turn to glucose when ingested. Including starches for instance, not just straight sugars. So you want to cut carbs. They're in cereal (sorry, that includes weetabix, muesli, porridge), potatoes, rice, corn, pasta, bread... Brown or white doesn't really matter, alas. Fruit also contains a lot of sugars, though avocado, tomatoes and berries are okay. So what does that leave you with? Meat (bacon is your new best friend), fish, eggs, above ground veggies/leafy greens, nuts, butter, cheese, full fat greek yoghurt, olives, extra dark chocolate, that sort of thing... So in practice, meals could look like this:
3 eggs with bacon, cheese, mushrooms and/or sausages (high meat content). Salad with a can of tuna, capers, olives and avocado. Or goat's cheese with salad and a nice vinaigrette. Meat or fish with loads of veggies, with bacon if you like, and cheese. (Cauliflower rice is insanely versatile). Snacks could be pork scratchings, (I like mine with mayo), Lindt's 85% chocolate, olives, cheese, cold cuts, nuts... Heck, you could even go to Burger King and order a burger, just tell them to hold the bun. They won't even blink at the question.
You also want to get yourself a meter. Test before a meal and 2 hours after first bite. If you don't go up more than 2.0 mmol/l, that meal was perfect and can safely be repeated.If it's higher, then there were more carbs (and thus sugars) in there than you could process back out again. A lot of us eat to our meter, but once you know what certain foods do, you can just go without testing. but at first, a food diary with testresults would be handy, for you and your doc.
It'll be okay. You'll get a grip on this. And like I said, you can read all of the above and forget it immediately, because you're in shock right now and it's alright: the ability to concentrate on such things will come back to you. The most important thing to take away from this is you will be okay. Really. You will be. This is not the end, you're not doomed, you'll handle this.
Good luck,
Jo