Ennui
Regular Poster
- MBTI
 - INFJ
 
Ah.  A subject rather close to my heart.  I like to describe it as when a 'want' suddenly becomes a 'need' when it is not in fact a necessity.  It's almost an obsession in bad cases.  You can't stop thinking about what you're addicted to and once you get it, begin to think about when you'll get it again.