Most successes are unhappy. That's why they are successes - they have to reassure themselves about themselves by achieving something that the world will notice.
In short, I am doing what I can, I suffer with the same universal suffering, and I try to assuage it, I possess only the puny forces of a man, and I cry to all: “Help me!
I think one of the defining moments of adulthood is the realization that nobody's going to take care of you. That you have to do the heavy lifting while you're here. And when you don't, well, you suffer the consequences.
Hitler suffered acutely from meteorism; perhaps he did not suffer so acutely as those around him, since meteorism is uncontrolled farting, a condition exacerbated by Hitler's strictly vegetarian diet.