Trying to loose this weight. Help :-)

Christina • Hello I`m a 23 year old university student studying Social Work. I struggle with Polycystic Ovarian Syndrome (PCOS)
Hello I'm a 23 year old woman who is 5"10 and weighing in at 270. I have lost 20lbs since April but now I'm stuck. need to loose this weight. I have PCOS and type 2 diabetes (happened due to my PCOS). I want to loose 70lbs. I'm very muscular and tall so 200lbs for me is ideal
I need help with controlling junk food and carb cravins the most. I do eat healthy for the most part bowever I need help with a substitute for this late night and in between meal cravings. I eat a lot of lean meats and veggies however I also have a large carb intake. What are some good substitutes for carbs. Like are their other healthier options for things such as bread and pastas?
So excersie tips
Food tips and suggestions
And just advice would be so appreciated.