Hi nicolace,
Thanks for using the Apple Support Communities! I'm sorry to hear that you had this issue with your Notes. I'm a bit unclear on what may have happened, but if you have been using the updated version of iCloud Notes, you may want to see if the notes can be recovered/restored as outlined below:
If you’re using the updated Notes app, you can recover and edit iCloud notes you deleted in the last 30 days on iCloud.com or your devices with iOS 9 or later or OS X v10.11 or later that are signed in to the same iCloud account. However, you can’t recover notes you permanently removed (as described in “Remove deleted notes immediately using the updated Notes app,” below).
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Go to Notes on iCloud.com, then click Recently Deleted on the left.
If you don’t see Recently Deleted in the folder list on the left, you don’t have any recoverable notes.
If you don’t see a folder list to the left of the notes list, you’re using the original Notes app and can’t recover deleted notes. See “Delete a note using the original Notes app,” above.
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Click a note on the right, then click Recover at the top of the window. The note moves to the Notes folder.
To recover directly to a folder other than Notes, drag a note from the Recently Deleted folder to another folder.
iCloud: Delete a note
Regards