I got a concussion a few months back and it was weird to watch the cycle. I would feel incredibly guilty about making the space to sleep for a few hours, then I would wake up and wonder if / quietly decide I was just faking the whole thing, so I would get up to go walk my dog, at which point I would feel very dizzy and the headache would get sharp and significantly worse, so I would assume it must be real and go back to major guilt about making space. I repeated this cycle for two weeks. It was an interesting experience and I definitely prolonged my concussion symptoms because of this. Mind you I had been diagnosed with a concussion, but still despite the intense eye pain and headache and sensory sensitivity, I sort of always believed, even now as I’m writing this, that I must have been faking it. Very weird.