Mikey:
The one in 2000 was a different one. That (the 2000 incident)
was a real health scare turned into an angle - a variation of the
"worked shoot",if you will. In 2000,Flair had some kind of inner
ear deal that caused him to collapse before a match,but that
was at a Thunder,not a Nitro.
Although it wasn't a major thing,he did have to take some time
away,and Russo decided to turn it into an angle for TV to explain
things; especially since Jarrett was in the middle of a feud with
Flair at the time.
Hope that helped