All iCal Calendars vanished

Help!
I have no idea how this happened, but today I opened iCal and all of my calendar information -- ALL OF IT -- is gone. I have been keeping a daily calendar, listing all activities for the day, for over a year. It vanished. When I tried to page through the months, all of them horrifyingly blank, a transparent grey shading appeared all over my screen with text in the middle that said, "You must restart your computer." I did. Re-opened iCal. Happened again. I used Disk Utility to verify and repair permissions, and now I can open iCal without the grey screen appearing, but it's still empty. I looked in my Users folder in Library/Calendars, and all 4 of my Calendar types have been updated as of this afternoon, with only 4 KB of data. Empty.
The only thing I can correlate this with is that a few days ago my computer began unexpectedly freezing after I created a "Internet Sharing" setup for my housemate to access the internet over AirPort, from another iBook, going through my computer to share the cable modem I access via an ethernet cable. We discovered that after a while of his using the internet connection, my computer freezes and I am forced to restart. By freeze, I mean that the cursor can still move around the screen, but I can't click on anything. I am afraid that one of the times I had to restart I had iCal open and somehow it got saved in a bizarrely empty state. Is this possible?
Another weird and possibly related thing is that one of the times I had to restart, when I reopened my Mail program, all the emails in my "drafts" folder were marked "unread." (This has happened to me in the past upon a forced restart, when every email in my inbox or "junk" folder were marked as unread but things were otherwise ok. And just about a year ago, for no apparent reason whatsoever, my Mail program opened as if I had reverted to factory settings, and I had to reinstall all my email from a backup. Could these things be related?)
Obviously I am in no way Mac-savvy in terms of the workings of this mysterious machine, and I know I may not be giving all the necessary information. But any info anyone can provide would be immensely appreciated.

Isis
I rather stupidly tried to download my iPhone Calendar to iCal and it ate that too. I finally just reloaded the software and download my calendar from MOZY. I now back it up every day and sync it with Google. I am disappointed though. I switched from a PC last year and was excited about my Apple. Looks like nothing is perfect.
Merry Christmas!
Ra

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I accidently brushed my keyboard with the side of my hand, near the bottom right of the KB.
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Message was edited by: Erin Waddington

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iCal[179] *Assertion failure in -[CoreTask OutlineView _uncachedRectHeightOfRow:], /SourceCache/AppKit/AppKit-949.43/TableView.subproj/NSTableView.m:1574
iCal[179] rowHeight must be > 0
iCal[179] rowHeight must be > 0
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<Email Edited By Host>

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All iCal Calendars vanished

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