jeez, I can relate - it sucks. I usually feel listless, even breathing is an effort. I fold into myself, watch comfort tv (ex Golden Girls re-runs) something strictly background noise.

I keep a chart for when I hit the emotional skids, to make sure I do what is minimally necessary for myself, and ensure the pets are cared for. It's a literal checklist, only 10 or less items, so I can crash w/out guilt, and not create significant irreversible damage. Nothing give me any pleasure, total "why bother?" mindset, dissatisfaction w/out the energy or care to change it