http://blogs.discovery.com/dfh-sara...-check-for-these-5-nutrient-deficiencies.htmlWhen you’re stressed out or anxious the body uses up your B complex vitamins. The B vitamins help with nervous system function. Deficiencies in vitamin B can lead to anxiety, irritability, restlessness, and fatigue. B-vitamins include B2, B6, B5, B12, etc.