Hi Jackie,
Everyone felt the same when first diagnosed. I am still struggling to get my head round it after being diagnosed in January, but I am getting there. Everyone is different as regards which foods suit them and which don't, but we are all in agreement that carbohydrate intake MUST be reduced. By how much depends on the individual, but basically be very wary of bread, potatoes, rice, pasta and pastry. I started by limiting my intake to 150g a day, reducing gradually to my current level of between 110 and 120g a day. In order to make up the calories lost by cutting carbs you need to watch that you eat enough protein and fats. I set myself a calorie intake of 1200 a day. My daily intake is roughly 35% carbs, 45% fat and 20% protein, although the fat and protein levels do vary from day to day.
I bought some handy jug type digital scales and weigh everything unless I know absolutely how much I have on my plate. Many of us use an on-line food diary/carb counting website/app called myfitnesspal, I also bought a book called Carbs & Cals from Amazon. It is advisable to keep a food diary of everything you eat and drink along with weights/portions, carbs, cals, protein and fat contents. You must learn to read all the food labels of everything you buy, ditch the low fat or no fat options because they often contain a lot of sugar, and ditch all the junk food, cakes, biscuits and so on.
There are many knowledgeable people on these forums who will be only too happy to help you and answer your questions, and please read as much as you can.