What you're describing as anhedonia also includes avolition. At least in my case, there are three components that feed back into each other: avolition - that lack of impulse to do ... anything, even when there are strong stimuli; executive dysfunction - even if you're ready to act, a sense of being overwhelmed by choices and unable to put one foot in front of another; and anhedonia - even if you're finally doing something pleasant or productive, there's absolutely no mental reward or lasting sense of accomplishment to build upon. A row-row-row-your-boat of suck as it were.