I should report in. I found this thread last Saturday, as I was starting a pretty strong pre-Christmas-exertion crash.
I did my best to break up the remaining Christmas activity with 15-20 minute rest breaks. I was able to rest pretty well and consistently Sunday and Monday, then we had to travel an hour to loud, rather chaotic extended family on Tuesday, I had shopping to wrap up with DH on Wed and we traveled again (through heavy snow that turned the return trip into 2 1/2 hours) to celebrate with the same family yesterday.
Though I had periods of that profound mitochondrial exhaustion, a return of light heart palpitations, and flu-like symptoms episodically throughout, as the days went on, I was able to bounce back from feeling exhausted and sick with a rest period. The greater energy/well feeling lasted from 15 minutes to an hour or more sometimes.
I'm surprised that I feel as well as I do this morning (I don't feel like I'm in a crash, just the usual low-level fatigue) and I'm excited to incorporate these rests into my days now that the huge extra stress of the holidays are gone. Can't wait to see how much better I can feel!
One other thing I've noticed, I've consistently slept 9 1/2 to 10 hours a night for several years now, exhausted deep sleep every night. The last couple of nights I've been waking up feeling as refreshed as I'm likely feel with this dysfunction after 8-9 hours. Resting during the day is shortening my nighttime sleep, which should have been a no-brainer to consider, but I've always hated napping so I've resisted it. (Lying in front of the woodstove with the cat snuggled up to me has made napping much more appealing.
)