Hi Danial,
The menus suggestions are merely suggestions, or guidelines, to help you find ways to fit in a balanced, healthy eating plan. You do not need to follow them exactly. Make it work for you and your busy schedule. You should have enough energy to meet your work demmands because of the healthy balance of proteins, carbs and fats.
You may want to consider mixing a protein shake as a snack or a protein bar like Myoplex Lite (just make sure you are watching the calories). Snacks like fresh fruit, almonds, yogart, etc. will also help to pack to an energy punch throughout the day.
I know it will take a bit more planning, but it will be worth it in the end when you are losing weight and feeling good.
Good Luck,
Paul