Sorry to be the bearer of bad news, but is a good lesson leaned about torquing properly and using the right tools I should think. BTW gotta love silly advice from people who've never had their head up behind the wheels let alone been in that predicament!
OP save yourself a lot of work and heartache, bite the bullet (or in this case the wheel nut) with the proper device called a lug nut removal tool.
Looks like this:
This sacrifices the wheel nut of course but keeps the studs in tact. Should you not have the time or otherwise due to cost and availability of tool and / or mechanic, or just plain freaking that you can get the bloody thing off like me, you will need to drill off the nut from the lug, and replace the lugs and the nuts of course. This is easy on the front, more work on the rear (at least 2-3hrs).
[video=youtube_share;Nplb68BGrMQ]http://youtu.be/Nplb68BGrMQ[/video]