What is the difference between affect and feeling? What exactly is the difference between affect and feeling?

Affect seems to refer to conscious experience:


  Affect is the experience of feeling or emotion.


And confusingly, so does feeling:


  In psychology, the word is usually reserved for the
  conscious subjective experience of emotion.


I realize that the definitions of emotion and mood are dicey as there are several different approaches (with corresponding definitions) in common use today.  But is it the same for affect and feeling?  Are there accepted definitions, or even accepted parts of definitions?  Or do definitions depend on the emotion model?
According to constructionists (e.g., Russell &amp; Barrett, 1999), affect (or "core affect") is a composite of valence and arousal, which underlies all emotional experience.  So when I feel good and highly aroused, that's affect.  When I categorize my affect (good, high arousal) as excitement, that's an emotion.

According to those who consider emotions to be multi-componential reactions to the environment (e.g., Gross, 1998), affect is an umbrella word to describe anything related to emotions or mood.  It's definition isn't as specific as the one above.

On the other hand, "feelings" has no specific definition.  It's a vague term that most emotion theorists don't use because it could refer to almost anything (e.g., interoception, nociception, exteroception like touch).  To specify that feelings are specific to the affective domain, we often use the phrase affective feelings, but it's not a word that's central to any modern emotion theory that I know of. 

So when in doubt, don't use the word feelings. But do use affect, emotion, or mood, as long as you explicitly define them using whatever theory you subscribe to.