Taking care of your food will be very important. Especially with such long hours. You eat each day, so the best thing you can do is get into a routine with your food. This will be the backbone of support for all your other healthy, losing weight strategies.
Make breakfast routine. If you can pick one meal a day to make the same each work day, it's breakfast. Other meals can get boring if you eat the same thing each day, but breakfast seems to be the exception. This can differ, depending on if you have time to eat at home or not. Sometimes it can be easier to break this up into two smaller meals.
You might try having a smoothie before leaving for work. I would research recipes to get the % that you want. Great things about smoothies is that they will generally use frozen fruit, which you can stock up on and not worry about spoiling. I would seriously add some GOOD fat to your smoothie. It will help it be more filling. I'm thinking a tablespoon of Flax Seed Oil or Olive Oil (I know. It sounds weird, but it makes it creamy and the fat will make it satisfying and will help you get your Omega-3s in, which are very helpful for fat loss).
For a second breakfast, like a midmorning snack, you might have hard boiled eggs and some fruit.
Pack Food
My husband packed a lot of food to take with him for his work day when he was commuting 120+ miles a day. We got him a very simple styled soft-sided 12 can cooler. I took the cooler with me shopping to get containers that fit in the cooler in the best way. I found that the rectangular Pyrex dishes worked really well for a hot lunch (heating and eating from the mircowave). You can find a variety of other plastic containers for cold foods and salads. We also used those microwavable bags for hot veggie sides.
If you can find a way to create a sort of standard for your lunch food, then packing lunch will be much easier. Here's what I did for my DH.
The morning snack:
hardboiled eggs and fruit (used two smaller square plastic containers). Usually this fruit would be a cut up kind of fruit, like berries, pineapple, melon, etc.
Lunch:
Main dish (usually the Pyrex): leftovers from dinner OR something that I had premade to be used exclusively for lunch. Examples: rice and crockpot chicken; rice and black bean chili; rice and grilled chicken; rice and chicken stirfry (you get the idea).
Side dish: depending on the meal, there could be a bag of microwave veggies. This would go well with grilled chicken or crockpot chicken. Makes a kind of rice bowl with the veggies. OR could be a green salad. OR could be another type of salad (black bean, black eyed pea, grain based, etc etc). I had a large rectangular container for green salads, and I found a packable liquid container to use for packing dressing.
Afternoon snacks:
Veggie container: ALWAYS took cut up veggies for snacking. Make your own mix, but I found that celery would save cut up well in the fridge. I could cut the whole bunch when I first bought it and that made packing lunches easier. DH would usually take celery, carrots, bell peppers, cucumbers, grape tomatoes. Sometimes, he would odd things that were cheap, like zuchini.
Nuts container: MEASURE these, but these are a great snack. The fat keeps you going, is healthy fat and is satisfying.
Fruit: One of the easiest things in the world to pack. Pick something that makes you chew a lot like an apple.
I've tried to indicate this, but one of the best things you can do for making packing your food to go easier on yourself is to make yourself a lunch kit. Don't use the containers for anything but lunch. Packing leftovers makes lunch easier. Packing it the nightbefore makes mornings easier.
Preplan Dinners
If you follow this strategy, then planning your dinners becomes ultra important because they really become the basis for your lunch. And let me tell you, it is a whole lot easier to pack leftovers for lunch than to spend the time to make something like a sandwich.
If you work long hours, then a crockpot could be your best friend. Also, learn to cook A LOT when you do cook. Like a PP said, make a salad that will save for the week (I love bean based salads for this) and use that for lunches.
Buy family packs of chicken and cook it all. Then you have cooked chicken to use. With the cooked chicken, for a week's worth of lunches you could,
1: Have the rice and chicken and a bag of veggies for lunch.
2: Pack tortillas and other fajita/taco toppings in one side dish container. Pack the chicken in the main dish (heating up container) and make tacos for lunch. If you can, have a bean salad side dish and have that in one of the half sized (smaller rectangular containers).
3 & 4: Make a chicken salad. Use the chicken salad for a green salad topper one day. Use it for a sandwich another day. Also have that side salad with each.
5: Pack a bun and other fast food like grilled sandwich toppings to make your own grilled chicken sandwich. Have that side salad here too.
I know this is a long post. I hope it helps though. The whole lunch thing was really a struggle to figure out. This is how I dealt with it. I hope it helps you to hear how I did it, even for inspiration to adapt to your own needs.
You're not alone.