You mean Thrall the Warchief? I believe the closest you can get to him in DotA is Chen the Holy Knight (all his spells are from so many different heroes it's almost impossible to find a match that is close).
Actually it feels more like a sudden involuntary loss of sense more than anything. If it's a really bad one, I lose touch with my self completely and collapse physically and mentally (the correct term would be fainting). I'm orthostatic intolerant so I get them very frequently and have been for most of my life.