Wow! Hope you didn't get a face-full of hot coolant!
That ain't fun AT ALL!
If the hose just blew off the rad. neck, but didn't split, the clamp prolly was loose. Hopefully, it did no damage...if it wasn't too far, and you drove nicely, you're prolly ok, but I would change the oil before driving it too much again. As far as the temp gauge not pegging, they have to be touching the coolant to register corrcetly, so if it was low on coolant, it wouldn't go to "Hot"...
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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"