Hi, bobmesagj,
Try looking in the iMovie Backups folder to retrieve a previously automatically saved library in the mid-November time frame.
To get to the iMovie Backups folder, follow this file path from the Finder menu:
Go/Home/Library/Containers/com.apple.iMovieApp/Data/Library/Caches/iMovieBackups
When you get there you will see a list of previous backups of your iMovie library. Click on one dated just before
your issue started. iMovie will open in that library. It will not overwrite your current library. Navigate to your projects browser (where your projects are displayed as icons) and see if your projects are intact.
If the above doesn't solve it, try using you Time Machine backup, if you have one, to restore your library to a point in time before losing the edits. Restore it to a different location than your current library, or it will overwrite the current library.
-- Rich