In article , says...


Sounds like the feeling when the flaps finish fully retracting, and the
plane momentarily dips, as it accelerates, and settles on a new angle of
attack. That is about when that occurs, and it is a bit of a strange
feeling, and could cause a bit of vertigo.

Also, it is about then that the cabin starts building pressure, to keep you
from feeling like you are way high in the atmosphere.

Good suggestion - however, the flap retraction is usually several minutes
into a flight - if the OP's suggestion that this event happens within the
first two minutes of flight is accurate, this would usually be a bit too early
for flap retraction. Also, retraction of the flaps is so well compensated in
today's airliners that it is not usually associated with a perceptible change
in attitude (though I admit you can feel "something" at this time). Finally,
while it is true that the pressurization cycle starts at this time, the
pressurization only compensates for the loss in pressure due to the climb. At
no point does the cabin pressure exceed the initial, ground-level pressure.

The visual perception of the tube "pointing upward" is an excellent
suggestion, and could be related to the OP's observation that his experience
is different if he is in the back of the tube.

As to G's questions, when I say I can't see straight, I don't see
blackness, I see the same way I see as if you've just been spun around
a lot, meaning I can see everything, no bluriness, but nothing is
really staying put, kind of bouncing all over the place. The same thing
you'd see if you were squirming around...

Well, I don't want to beat a dead horse. If you do not have headaches, I
suppose it is very uinlikely you are suffering from migraine. It's the visual
disturbances that made me wonder about that - migraine sufferers call this
"aura".
http://www.migraine-aura.org/EN/Clas...turbances.html


In ther end, it's probably some sort of vertigo or spatial disorientation, as
others here have suggested. It would certainly be worth visiting a doctor, if
only to rule out anything serious. And don't even think about getting a PPL!!
:-)