Tired, but not giving up

He feels like a five-foot-eight-and-a-half solidified sadness.
His chest: an overinflated balloon, a puff of air short to exploding.
His eyes: waterfalls of tears and sleep-deprived crystals.
His brain: a network of uncertainties, never resting easy.
His heart: meek and humble, beaten and bruised, tired, but refuses to give up.