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Same experience but explained differently; let's put a thick and reasonably wide wooden plank on the floor and walk over it. No problems at all, right? You can even jump around if you like.
Okey, well, now put this wooden plank as a bridge between two high buildings and make sure it's rock-solid in place. It's still the same plank, it's still the same distance and requires the same kind of action, only difference is the brain will now react to the possibility of extreme danger and will try to make you nót walk over that wooden plank. That's the controlling 'mind' pulling some of your strings. That's why it usually takes a lot of confidence to be able to do such things without starting to have balancing issues or without sweating.

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wow this explanation makes sense..made my day thanks !
next time on a height I know how to trick my foolish brain