To me, saying that "you don't want to be doing it" (paraphrased as "you are upset" or "you haven't slept"), is much more of a fake bullshit than the other thing. Be an adult take responsibility for your actions, don't blame "the guy" (your boss, your company, the economy, whatever).

If you really hated doing it, you wouldn't be doing it. Quitting yourself is always an option.