Water is the key. Lots and lots of water or green tea or something similar. I'm not going to lie the next few days will be hard. You'll feel tired and hungry and generally a bit rubbish but when you step on the scales at the end of the week you'll feel great and that will spur you on. Would you normally have had all your food by now? (Some who work shifts would, but evenings is when I struggle more so I save a product for then) I just ask because if you're peckish now later might be hard!