I have been through temesic withdrawyl - Had it for legit pain after a car accident. It stops being effective for pain after 5 days. The WD was MUCH less severe than even hydro - I cannot imaging Methdone or Morph. Since by the 7th day you are not getting the euphoria - you dont miss that. a few (3 a day) 10mg hydros eliminated the temesic WD. It was ideal for me and crisis pain - since it is not effective (for PAIN) beyond 7 days there is NO danger you would take it for side effects (i.e. sedation euphoria)
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Hope this helps