Not sure if there is an actual name for this- but I've decided to coin the name "shadow days" for what I'm going to explain. I also have a history of depression,but not sure if this could be explained by any undiagnosed issue I might have as well. 

Anyway, my "shadow days" are usually a string of a few days where I'm not myself. my mind goes dark and I just get lost in my thoughts.  I have no energy to do the dishes, cook, clean, work (currently wfh), or even take care of myself. whatever little energy I do have goes into taking the bare minimum care for my dog. I usually lose all rational thinking, like last night I wanted to just dump my whole life and move to the Caribbean on a whim. It's also during these days I pick the most fights with my SO.  I call it shadow days because it might last a week tops, then I'm bouncing back, cleaning up the mess I ignored the whole time.  But I also feel like a shadow the whole time. I start hating who I am and my life and overall just a dark feeling clouds the few days I go through this.  I have energy to cook, and do the dishes, and take my dog for long walks. I don't know what triggers them so it seems like it comes out of no where and there's no set time between these episodes either and I'm not manic during the off periods (I just feel normal, like I can do the things I need/want to do). I can be normal for weeks then suddenly I'm stuck in the shadow days for a little bit.

I'm not really sure if this has an actual, clinical name if anyone knows it. Just curious if other people experience similar moments like this.