Hi and welcome. Most of us, if not all found the diagnosis somewhat overwhelming. Shock, guilt, embarrassment and grief even, are all common emotions too.
As
@Neens has said there are many members of the forum who have lost lots of weight and got their BG levels under control, mostly via a low carbohydrate diet. That involves cutting down on not just the sweet, sugary stuff including quite surprisingly fruit dried fruit and fruit juice, but also starchy carbs like bread, pasta, rice, potatoes, breakfast cereals etc. That may seem like there is not much left to eat but eggs meat fish, nuts, mushrooms, salads, leafy green veg like cabbage, kale, brussel sprouts and spinach, Mediterranean veg like tomatoes, peppers, aubergines, courgettes etc and cauliflower, broccoli and leeks are all good. Full fat dairy like whole milk, cream, cheese, butter and creamy natural yoghurt are also on the menu, so it is not all bad news. When you eat fruit, anything with berries in the name is better than more exotic fruits like bananas or pineapple but keep portions small and just one or two at most portions of fruit a day. Surprisingly eating less carbs not only lowers your Blood Glucose levels but also means that most people lose weight without even trying.
Investing in a Blood Glucose Meter can be very helpful in managing your diabetes as we all have different tolerances not only to carbohydrates in general but different types of carbohydrates, so some people can get away with eating a small portion or potatoes but pasta sends their BG into orbit, whilst others can manage a slice of bread but potatoes are like eating sugar to their system. This is because we all have a different balance of bacteria in our gut which is responsible for breaking down our food, so we all digest carbohydrates differently. Testing before we eat and then 2 hours afterwards will give us an idea of how we responded to that food and if we need to reduce the carbs in that meal next time or remove that particular carbohydrate from our diet altogether. BG meters are relatively inexpensive @ approx. £13 for the instrument itself, but the on going cost of buying test strips for it can tot up the finances and for that reason the 2 meters with the cheapest test strips are often recommended. These are the SD Gluco Navii (previously the SD Codefree) or the Spirit Health TEE2 Blood Glucose Meters. Test strips for both these meters are £8 for a pot of 50 as oppose to £15-20 for some other brands.
Hopefully I have not overloaded you with too much info, but if you don't understand or need more specific advice just ask. Diabetes is a marathon, not a sprint so take your time to come to terms with the diagnosis and start to make changes. It doesn't need to happen overnight. I think it took me about 5 weeks to wean myself off carbs and I can say that I really enjoy my new low carb, higher fat diet and feel that it is sustainable for the rest of my life.