Use the little macro "RebuildActiveDocument" to grab all your text, unformatted, and rebuild the document.
CAUTION: make a copy of your document using Windows Explorer before running this macro.
Sub RebuildActiveDocument()
' Get the name of the source ActiveDocumentument
Dim strFilename As String
strFilename = ActiveDocument.FullName
' Get the stoty-content of the ActiveDocumentument
Dim strStoryContent As String
Dim lng As Long
For lng = 1 To ActiveDocument.StoryRanges.Count
strStoryContent = strStoryContent & ActiveDocument.StoryRanges(lng).Text
Next lng
' Close the ActiveDocumentument WITHOUT saving changes
ActiveDocument.Close (wdDoNotSaveChanges)
' Create a new ActiveDocumentument
Documents.Add
' Insert the text file
Selection.TypeText (strStoryContent)
' Save the ActiveDocumentument with the original name
ActiveDocument.SaveAs (strFilename)
End Sub