A Microsoft file hosting and synchronization service.
You may be logged into a temporary account.
Open Windows File Explorer
Navigate to C:\Users
Do you see two user folders that look like yours?
Open those folders and check inside Desktop, Pictures, Documents... etc. and see if your files are there
If your files are there:
NOTE VERY IMPORTANT: Do Not copy your files into the Temporary profile you are currently in, when the situation is corrected, your files will be deleted with the Temporary Profile and will not be recoverable !!