Please don't starve yourself or do anything extreme. The first 2 weeks of a low carb diet is when you lose weight the fastest, so that would be ideal, and keep you full whilst you're doing it. Try eating this (and nothing but this!):
Breakfast every day - 3 or 4 egg omelette with cheese or ham or mushrooms, cooked in butter (or fried eggs, scrambled eggs and bacon, though not bacon every day 'cos that's a lot of salt).
Lunch - tinned tuna in sunflower oil mixed with full fat mayo, over lettuce leaves, chopped spring onion and cucumber, or pan fried white fish with a sauce made from double cream and Parmesan if you can cook at lunchtime.
Dinner - steak, or lamb chops, pork chops, salmon fillet, chicken breast (skin on if poss) pan fried or oven baked with suitable spices and maybe some mushrooms. Cauliflower, cabbage, or broccoli dressed with melted butter, maybe with some grated cheese sprinkled over.
Try to stick to water for drinking and avoid the Diet Coke, because it can trigger an insulin response, despite not having any sugar in it.
A low carb diet can be a lot more interesting than this, but rather than explaining it in great detail, I just thought I'd give you a basic diet you could stick to for 2 weeks without going hungry. Hardboiled eggs are a good snack if you need one, or a small piece of cheese. Best of luck!