I just did a search for anhedonia and your post came up. I have schizoaffective d/o and have had anhedonia for a few years now, maybe longer. It's awful. It doesn't matter how sunny it is outside, in my brain, it's grey and overcast.

Before searching here, I ran across this posting Anhedonia And Other Negative Symptoms : I Have Schizoaffective Disorder Story & Experience It's kinda long and I don't know how accurate the information is, but a large part of that article could've been written by me. Same thing with your post. I think what Odysseus said about it being like a jail sentence is such an apt description.