This statement is disconcerting. Dominance should not be done out of frustration (or anger either). A dominant should be in control of his or her own emotions during any power exchange. That's not to say a dominant should appear aloof and detached, but negative emotions have no place in a D/s scene.
That being said, there will be times your Dom/me relies upon you for emotional support, just as you rely upon him/her for the same.