Sit down with your character. Ask them to put a hand over their heart. Then ask them "What does your heart long for?" Let them speak for as long as they want to. Just listen. 

What is your character addicted to? Coffee, whiskey, sex, facebook? When did this addiction first start? What is the real cause, what truth about themselves or their past are they refusing to directly face?

Take your character to therapy. How do they react? What do they say or not say?