Was there a gap between trigger and onset of your ME/CFS?

This is a fascinating question! Beginning 7/26/90 I had a vicious GI bug that landed me in the hospital for a week. Intense diarrhea for 8 days straight. When that ended, I was really wiped out, as expected, but each day I felt a little stronger. Then I woke up on 8/9/90 feeling like I'd been hit by a truck, and that intense, weighed down, unrelenting exhaustion never went away. I've always wondered why I had the little gap of recovering health, and what trigger shut it down so rapidly and completely.

Edited to add that I was completely well before I got the GI bug, but I had had a terrible flu about 8 months earlier.