I Live, And Yet Methinks I Do Not Breathe

I live, and yet methinks I do not breathe,
I thirst, and drink, and drink, and thirst again,
I sleep, and yet I dream I am awake,
I hope for that I have; I have and want:
I sing and sigh; I love and hate at once.
Oh! tell me, restless soul, what uncouth jar
Doth cause such want in store, in peace such war?