Trevor,
Were you aligning the secondary mirror? If so, next time lie the scope on your bed or lounge so the screw driver doesn't go down the tube.
I gather you don't know the exact extent of the damage. I doubt you've split the mirror in two!
Don't panic. I dropped a red light torch into my 12" Meade truss DOB. It resulted in a couple of small chips and a slight scuff mark. Couldn't tell any difference in the viewing. The total damaged area is probably way less than the total area of all the other sh_t that gets on the mirror.
Try it out. You may not notice any difference.
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