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After reading a few accounts I'll throw my $.03 in - have to account
for inflation :^)

>Note that this happened on the anchor line, in warm water, with good
>equipment and no exertion at all, so metabolic CO2 production should
>have been well within normal for a body on a dive.

I believe that the onset of my of these physical phenomenon may be
specific to the given set of circumstances and, unfortunately, we don't 
yet know how to sort out all the minute details.

I have had small amounts of paranoia creep in at 165 ft on one day,
perhaps it was justified for various reasons - e.g. it was my first
dive to that depth, and I have felt perfectly fine down to 220 feet on 
another day, after having successfully done several other dives
in the 160-200 ft range.  

Similar to Dave, I was in warm water with very little physical exertion on 
the way down.  I did notice that once down at 165 feet and I started 
swimming along the wall a little, the feeling started to subside.  I do 
believe that the dive to 220 feet started with a little more exercise than 
the one to 165 ft because I was concentrating on taking video (at least at 
the shallower depths) and did gently cruise after some barracuda.  
Other than that, the descent was relatively quick but we didn't go down
like a shot (i.e. down to max depth in roughly 3 minutes).  The
time at depth was relatively short (less than 5 minutes) and in both
dives we started a slow ascent.  Things always felt normal on the way
up except that I do remember starting to come up from 165 ft, looking up
and thinking to myself - that's an *awful* long way up (I could see the
surface!).

As far as I can see, the main difference between these two dives were

1) Experience
2) Slight amount of exercise (with all the accompanying physiological
	differences)
3) Other non-tangible differences that are impossible to quantify at
	this point (i.e. I don't remember how much sleep I had before
	each of these dives, what I had to eat, etc).  

#3 *may* contain major factors that cannot be determined and
	may totally swamp the effects of #1 and #2.

- -Carl-

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