A family of Microsoft word processing software products for creating web, email, and print documents.
Have you tried re-attaching the original template?
Changing the Attached Template http://wordribbon.tips.net/T005998_Changing_the...
Templates, when attached to a document, can greatly affect how that document looks. You can change from one template to another at any time, as described in this tip.
maybe you'll get lucky and things will go back to where they were. ...
If you were saving to OneDrive, did you check the recycle bin there too?
RESTORE DELETED FILES OR FOLDERS IN ONEDRIVE RECYCLE BIN
https://support.office.com/en-us/article/restor...
If you accidentally delete a file or folder in OneDrive, you may be able to recover it later from the OneDrive recycle bin.
OneDrive Files always Open Read Only
The solution for me was to right click on the folder containing your documents, go to properties and untick the Read-only attribute. You can do this for one specific file as well or a folder containing other folders. Hope It helps.