You're acknowledging the frustration that you have to think about your food when others don't which is healthy and perfectly normal for anyone, diabetic or not, on a diet. Chances are your body is trying to get used to the new diet and that adjustment can take time and effort. Symptoms include headache, fatigue and irritability.
Recognise you're temporarily in a bad patch and that it's OK to feel down sometimes. Strengthen yourself by doing something to make yourself feel good without involving food. Ask your man or children to help you out - if you can turn this into something fun, it really helps.
I've found if I'm on a schedule setting an alarm on my mobile phone to remind me to do drugs works wonders. Sometimes I need to make the cues tangible and it helps build new habits.
If you have the option to take a walk when people are bringing food into your workplace, do it. If you're asked why, explain you're on a diet and you're finding that food really distracting. I found going to get yourself a drink, say black, Chinese or ginger tea helpful - if your doctor is OK with those.
If you're still the same way after a week, go back to the doctor and ask if you can be a little more flexible on your diet. The OUT list sounds pretty specific but you can play within the rules, vary cereals (muesli, oatmeal (or porridge as we call it in England), cornflakes) and ask if your evening meat includes fish. Shop for recipes.
You can choose to feel better than you do. We're here if you want to talk more.