Addai Has Been Exhausted, Tense, and Anxious for the Last

Addai has been exhausted, tense, and anxious for the last year now. He worries about work when he is at home. He worries about what is going on at home while he is at work. Even when he is out with his friends, he worries. In fact, his friends have stopped asking him to go out because all he does is worry. Additionally, Addai suffers dizziness and nausea most of the time. Although Addai expects the worst most of the time, his fears appear greatly exaggerated. What disorder best seems to fit Addai's symptoms?

A) panic disorder
B) major depressive disorder
C) generalized anxiety disorder
D) conversion disorder