I assumed it was immune related, but as always, who knows?
This totally just happened to me....after getting acutely ill with a severe gastro shut down...that might have been a viral flair up (as I never went out anywhere to obtain a new virus).....
After about 7-10 days of post acute awfulness, some of the ME symptoms just sort of subsided...
my gut was almost perfect for the next 10 days.
I had far less mast cell-derived inflammation
I think I might have even knocked out the SIBO I likely have....
Aches and swellings were far less, and other ME pain was way less.
Now its sort of gradually reverting maybe...10 more days later.
THEORY:
body had to attack something in a big way. My immune system was entirely taxed, and major demands were given. I think it got temporarily AMPED UP somehow.
Then also the gut shift....my gut had no food for 7 days. What happens in the gut when that happens? No way can I fast for even one afternoon.