Removed Documents on D Drive?

I have a PC with Win 10 on C drive, but all my documents (pictures, music, documents) live on the D drive, which is a separate 3TB HDD drive on my PC.  I noticed that in Windows Explorer "Documents" folder was pointing to the OneDrive folder and not the Documents folder on my D: drive.  So I attempted to unlink OneDrive from my PC and told it not to sync with all my folders.  A couple folders were grayed out, in particular the documents folder.  So, I told OneDrive to completely unlink from this PC.  

I had no idea that OneDrive was even linked in any way to the Documents folder on my D drive, however, after telling OneDrive to go away I don't want you anymore, now everything in my documents folder on my D drive is just, gone.  I checked Recycle Bin, not there.  I did a reset/restore to a earlier date (two days ago), but this did not bring anything in the folder back.  What happened?  Where did all the documents go?