Ouch! As everyone else has said, at least you're ok, and the car is repairable. Not quite at the same speed but i cam round a bend on a country lanes at about 40 or 50 only to find a rock, almost exactly a cube of about 40cm. Being a single track road there was no where to go, and it went straight under the car and sent me sideways. I caught the slide and immediatly stopped. Got out and found a huge hole in the gearbox, luckily only in the clutch casing bit so no oil to lose. The casing was rubbing on the flywheel a bit so was making some interesting high pitched whining, but still drove it about for a few weeks before flogging at as i couldnt be bothered to fix it! But some c**t must have left it in the road, because it was very very out of place (it was a graden rockery type yellow stone).