Magrat, I'm beginning to think that your feelings of weakness/dizziness (and need to comfort with food) are as much about the misery of your work situation as they are about a biological need.
That being said, if you pack your snacks carefully, you should be able to do it. For example, a low-fat string cheese is 60 calories, a ziplocked bag of baby carrots (1 oz) is 20 calories, and a whole-wheat cracker thin is 30 calories. It shouldn't take you more than 5 minutes (max) to eat that food. Snack #2 could be 1/2 oz peanut butter with 2 sticks of celery. Snack #3 could be a large apple and 6 almonds, or an unsweetened greek yoghurt sprinkled with Splenda. You get the idea- all of these are prepped at home, take just a few minutes to consume, and are filling and fiber-rich. Pack each snack individually, and if you must, put each in a separate lunch bag (complete with plastic spoon for the yogurt, or plastic knife for the peanut butter) labelled #1, #2 and #3.
Good luck.

