You're basically stressed out and also under nourished. Breakfast is the most important meal where it provides the nutrients for you to start the day. Having a good nutritious breakfast is important. Eat some rolled oats with a couple of whole eggs (any style of preparation). Add a tablespoon of olive oil to your oats. Take a multi vitamins and minerals which is hi in B Complex.
Your stressful lifestyle is draining your body of Vit Bs hence you feel lethargic and stressed out.

You should spend your weekends with your family instead of working. Quality lifestyle is important to health.