Sub DeleteH7Text()
Application.ScreenUpdating = False
Dim Rng As Range
With ActiveDocument.Range
  With .Find
    .ClearFormatting
    .Replacement.ClearFormatting
    .Text = ""
    .Style = "Heading 7"
    .Replacement.Text = ""
    .Forward = True
    .Wrap = wdFindStop
    .Format = True
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = False
    .MatchSoundsLike = False
    .MatchAllWordForms = False
    .Execute
  End With
  Do While .Find.Found
    Set Rng = .Paragraphs(1).Range.Duplicate
    With Rng
      On Error GoTo ParaLast
      Do
       Select Case .Paragraphs.Last.Next.Style
        Case "Heading 1", "Heading 2", "Heading 3", "Heading 4", "Heading 5", "Heading 6"
          Exit Do
        Case Else
          .MoveEnd wdParagraph, 1
        End Select
      Loop
ParaLast:
      .Delete
    End With
    .Find.Execute
  Loop
End With
Application.ScreenUpdating = True
End Sub