dont fret too much yet,,,,, even if the worst is the worse,, get another hard drive ,, a cheep one,, format it,, set the other one as a secondary drive, then u can boot from the new spare one and acess all your stuff!
Well it sounds to me that your not "fucked", just a minor setbackj. I hope he can fix it and if he isn't able to, then we can try and there's lot of people on the internet to go to for advice. Good luck. Computers can be such a bitch sometimes.