I do experience that, yes, and I seem to notice that my badly functioning days seem to be a direct consequence of a stressful event, experience, day or period of time, and not necessarily a negative one, although those will definitely send me there.
It can be as innocuous as just too much contact with people with whom there was pressure for me to be more sociable than I can stand. Or too much to be busy with, even though none of the things are horrible things. I get through what has to be done but I then can barely function for a period of time after that.
Conversely, when nothing unusual has been happening, nothing stressful either positive or negative for a while, I find myself more capable of what most people seem to be capable of, and can cope. From this I've figured out that to just live at a "normal" level of efficiency and coping skills, I have to live at a "not normal" level of taking great care of how much stuff I'm exposed to that I can't handle without some kind of stress consequence.
.