There's nothing to worry about, the LHC is absolutely safe because we have observed nature doing the same things the LHC will do.
"Protons regularly collide in the earth's upper atmosphere without creating black holes."
http://uk.news.yahoo.com/itn/20080910/twl-big-bang-experiment-gets-under-way-41f21e0.html
And this is from the horse mouth and why are worrying about world ending at 5:30 it is not and when you see the is still standing you will say "well back to my crappy life" and that will be the end of that.