I couldn't close i cloud without agreeing to erase i calendar? I didn't realize it would delete everything on my computer and not sync?!

lululThelp,

Does this article explain what happened to you: iCloud: Calendar & reminder data removed from iCal when disabling iCloud Calendar?

If so, do you have any backups?

Can you still see your calendars on iCloud.com?

If you are syncing any devices, do they still contain your data.

What version of OS X are you using?