ICal events all deleted after syncing with computer

I synced my iPhone and iMac two days ago, and only this morning realized that ALL my events in my iPhone's iCal are now gone!! I've been keeping track of several important doctor's appointments, my child's school events, personal medical issues, etc and now they're all deleted. After checking, it seems SOME of the events from June were transferred onto the computer's iCal, but then "stopped" there and nothing else was copied. My phone and computer have synced successfully many times, always "sharing" information but never deleting! What's wrong? Can this information be recovered? In some cases, my phone was the only place this information was recorded, so now it's gone. Thanks everyone for your help!!!

Hi there,
I'm having the exact same problem as described above, and I'm a little desperate to get my iCal entries back as well...
Concerning the question of whether I have a backup: I'm actually not sure, maybe you can tell me whether I do? The situation is the following:
I entered a (significant!) number of iCal entries on my iphone directly. The iphone, in turn, is being connected to my MB Pro at home, as well as my PC at work. Podcasts and such are updated from my PC, so I'm guessing that the PC is the primary iTunes linked to the phone. When I connected my iphone to the iTunes on my MB Pro, however, it asked whether I would like to synch as well. As I had a number of iCal entries on my MB Pro that I wanted to also see on my iphone, I agreed. It warned me (like many times before) that this would chance more than 5% of the iCal entries, but it never before had deleted any of them! When I checked again, all my direct iphone iCal-entries had disappeared.
I have Time Machine installed and made a backup of my MB Pro just a few days ago - I'm suspecting though, that if the iphone iCal entries are gone from the iphone, my MB Pro iCal did not remember any of them either, correct?
PLEASE, if someone could help explain this situation, I'd be incredibly grateful! I've never had it happen before that iCal (on either machine) deleted anything...
Many thanks in advance!

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