Many moons ago I took a Primary glider into the air on a winch launch, no problem until (while on the wire) I took my feet off the rudder pedals (not sure why - probably to test a theory) - well I have never experienced such severe vertigo - quickly replaced feet to where they should be & all was well with the world.
Repeated the exercise off the wire with no problem. Assume it was because I could see the connection to the ground which I understand is the usual cause & yes I hate looking up (& down) while up a ladder or tall building - & as for those glass sided lifts in hotes & shopping malls
R2