First, don't feel bad about gaining weight on your vacation. A lot of people diet before a vacation so that they can relax and eat what they want for a few days. Think of it as "paying in advance."
As for your current diet, it's obviously worked for you before, so stick with it...sort of. I think the reason that your scale isn't registering a weight-loss may be because your diet is totally lacking in roughage. In fact, your menu is one long list of constipating foods. In other words, you've probably lost fat but it won't register on your scale until nature calls.
Do you think you could swap that package of blueberry muffins for a bowl of Raisin Bran with non-fat milk? And how 'bout adding some green pepper to those pizzas? Broccoli is delicious with those ham and cheese hot pockets, and it's only 15 calories for half a cup (I buy it frozen in a bag and microwave it with the Hot Pocket). And be sure to drink LOTS of water.