Ical randomly deleted my entire calendar

[mrrothschild]

today i tried to close ical. it glitched and got stuck in an unresponsive mode so i tried to force quit. i was presented with a "unsaved files will be lost" message but i never would have imagined that anything in my calendar would be considered "unsaved" so i hit ok. when i later opened ical i found that the entire thing is blank. my whole calendar is wiped out. this is a tragedy and im wondering if there is a way to recover what has been lost. i have tried restarting, doing searches in spotlight but no luck.

thank you for the time.

edit: i am running os x 10.4 tiger