We've all been there, saskia. Just focus on how good you'll feel when you see those scales move.
Great advice from LW about keeping snacks on hand. I have a sweet tooth so wouldn't have survived without yoghurt smoothies, sf jellies and mousses, muffins (of course!), sugar free sweets and gum, coke zero and sugar free drinks.
It's easy enough to make sure there is food in the fridge, but it's when you are out that you have to prepare well. Try making things like meatballs, boiled eggs or mini quiches that you can pop in a bag or tub for snacking (you can even get those lunch boxes with built in ice trays now). Packs of unsweetened soy milk are also good as they don't need the fridge. Try switching the crab sticks for smoked salmon if you can. And have plenty of chicken and liters of water!
And make sure you eat enough during attack - you're not trying to cut calories. Good luck!