Feelings: consequence of Universe

Why do feelings exists? What was the origin of them? Why they are present on every life, in every act we do? If we don't feel it, then others feel consequence of our acts.

Are all these useless feelings, that makes us do silly things, to make us test ourselves, or are a consequence of disappearing the Singular Nothing? Maybe feelings are the dark side of material reality.

I can't think of a better alternative. Great successes need great sacrifices, so it is OBVIOUS that God have made a great sacrifice (maybe) in order to create Universe as it is. Something so unpredictable as feelings can't be a pro; feelings must be a con.