Lost all Calendar events =(

Hi everybody,
I was adding an event to my Calendar app when it "crashed" and went to my home screen. I opened the app again and all of my events were gone like it was set to factory defaults. I had a ton of stuff in there. My questions are:
1) Do you know why it did this?
2) Is there any way to recover my events?
3) How do I keep it from happening in the future?
My iPhone is version 2.2. I sync it with iTunes, but I don't have it set up to sync with a program like Outlook. I haven't had any other problems with this iPhone except for today. The only thing I did different was charge it using a 3rd party Belkin USB cord last night. Could that have caused it?
Thanks for the help!

one thing that might help.
Try to restore the iphone from back up.
http://support.apple.com/kb/HT1414

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It would default to whatever account you have set for default. If you were using Exchange, it would sync to that. However, the settings for syncing are set up in iTunes. You would need to check to see what settings were in iTunes for syncing the information. It could be a supported application on the computer, or a cloud service as I said earlier.
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http://kb.hpwebos.com/wps/portal/kb/na/treo/700w/verizon/home/page_en.html
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Lost all Calendar events =(

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