Getting tired and irritable due to not eating regularly means you need more complex carbohydrates and good proteins. So...
Assuming an 8 to 5 day:
Breakfast 7:00 am: Hot cereal. Bob's Red Mill, the one without wheat preferably, or Lundburgh's Almond Brown Rice Cereal, or a mixture of Amaranth and Quinoa. Cook in water with a dash of Seasalt . Post-cooking, use Rice Milk, Flax Seed, and cinnamon or nutmeg or cadamom or ginger - or a combo - for flavoring, brown rice syrup for sweetening, or maple syrup.
Make up a protein shake and bring it to work wtih you, along with digestive enzymes. Drink around 10:00 am.
Lunch at 12:30ish: Morroccon Chicken soup - omit chicken, could be allergan for you at this point, add extra veggies, or Kichadi with plenty of veggies (can be eaten cold like a salad if it's a thick stew), or lentil soup and/or sweet potato (they're good cold too actually). Salad.
3:30 snack: apple or pear or both.
Dinner by 6:30, preferably earlier: stir-fried or steamed or par-boiled veggies with a basmati/wild rice pilaf or brown rice pasta.
Can have freshly squeezed veggie juice any time, with or between meals.
Can have breakfast for dinner, dinner for lunch, sweet potato for dinner, soup/salad for dinner, or dinner of all fruit if it gets late at night.