Since you are working, treat yourself to bio available iron. Floradix iron - you can get it online. Store in the fridge and take twice a day, 30 mins before meals. It is a pleasant tadting liquid with a full B vit complex to boot. They also sell calcium magnesium liquid, but don't mix them as the presence of calcium inhibits the absorption of iron.

As a temporary dietary measure, start combining iron rich foods with vit C and stop eating iron rich foods and dairy products in one meal. Cast iron skillets do release iron into the meal as well, so use them if you have them. Finally, iron rich foods have a synergistic effect. Say, cooking chile con carne with tomatoes in a cast iron skillet and having an orange with that meal would be a perfect choice.

If you don't drink coffee, Nuvagil tablets can work to carry you through the low energy part of afternoon.