The times I've felt like this have been in conjunction with slow-burn stressful events. I've also felt my body sometimes seem to handle nutrition differently un

The times I've felt like this have been in conjunction with slow-burn stressful events. I've also felt my body sometimes seem to handle nutrition differently under stress, like I'm keeping the lights on but actually joints and muscles feel terrible if the stress lasts too long. This is typically a retrospection thing, and not a revelation that occurs in the midst of the feeling. One day I'll wake up, make a huge breakthrough, feel great, and wonder if I've been asleep for a month. My memory of the period is also fuzzy. I think our brains are way more nuanced than we appreciate.