Sounds like a sadly universal experience. It's really unfortunate — Go is an interesting language, but the place they tell beginners to go to interact with the community is so utterly toxic to anyone who wants to ask any kind of question.
You can still do this (at least in Windows 7, the last time I checked.) Just look in the 'Mouse' section of your control panel, and select the one to make <Ctrl> radiate circles around your mouse :)
A whole lot. It depends on how fast it is going. See http://measurespeed.com/deceleration-calculator.php for a quick-and-dirty overview. Gravity accelerates at at 9.8m/s², so if it fell for one second before impacting the ground, and took (for instance) 0.05 seconds to deform before coming to a halt, it'd have experienced 8.91 Gs of shock.