If I spend one day doing a bunch of things, even just a couple, like going to grandson's soccer match and bringing him home, plus going to the doctor, the next day I'm likely to just sit in front of this computer and do nothing much. feel like not moving. Then the third day I'm able to function again. When nerves don't process things fast, maybe they have to catch up. Sounds ridiculous in a way but maybe.
I think it is a great hazard to us to feel that "angry and disappointed" you mention, but I think we must really work not to blame ourselves for the periods in which we can't do much but stare at something. I no longer stare at TV. I turned it off ten days ago because I got disgusted with it. I may turn it on sometime, especially when Downton Abbey finally comes back on. Politics has me fed up, so off with the thing's head until the morons are finished laying waste to one another.