Well let me clear up again that when I say "pressure" I do in fact have
no idea what Im talking about. Im not a scientist, Im not a pilot nor
have I significantly studied either. So I am just saying "pressure"
because I don't know what else to really call it all.

To answer Marks questions, when it does happen, it happens about 1
minute after the wheels leave the ground. There is a period in flight
(again, don't know what its called but I can feel it) about a minute
after take off when the plane feels like its dipping down and yet
flying up at the same time and its that time which causes the issue.
It feel a little like a negative-G feeling.

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...

I have never gotten a migraine before so I doubt its a migraine issue
(especially if it only comes out during the take off of a flight).

I totally do not blame you for thinking its a panic response, I know
anxiety (my father is a psychiatrist) and I've been aorund people with
psychological disorders. I also would know when I was suffrering from
one, and I too am very quick to dismiss most things as psychological,
but I can assure you this particular issue isn't for me. Within 4
months of 9/11 I took 16 flights, 4 in one day alone! Im telling you,
when it comes to flying, Im not anxious. Also, I am very familiar with
anxiety symptoms, they are much more general, they usually start
pre-boarding and last throughout the flight. Ive never heard of a
panic disorder thats lasts specifically 10 seconds, nothing longer
nothing shorter, and is immediately gone. No panic disorder can go
away that quickly without meds. Plus, and I know this is hard to
portray (nor do you have to believe me) butu when it happens, I
literally feel an outside force as oppose to anxiety which is way more
internal.