Complete! Incomplete?

One moment you know your life's just filled with joy!
The other it comes crashing down!
One moment you see the joyous face of a father!
The other it is the morose look of one that might have been!
One moment you feel the love brewing!
The other you kill it inside you!
One moment you know your eyes welting with happy emotions!
The other they just keep crying unhappy tears!
One moment you have a happy satisfied realization!
The other it all becomes an unsettled compromise!
One moment you are dreaming a content dream!
The other you want the nightmare to end!
One moment you know the world is yours!
The other it seems to be conspiring against you!
One moment your heart is overwhelmed with glee!
The other it experiences a vacuum!
One moment you want the whole world to know!
The other you wish it just weren't around!
One moment you feel you are now complete!
The other your incompleteness dawns on you!