These symptoms do not sound related to having stopped Darvocet (a super mild narcotic pain reliever).  Particularly after a week has gone by.  TAKING Darvocet can cause skin itching and decreased breath, common with opiates.  Darvocet is a synthetic opiate (man made).  Withdrawal symptoms would include:  shakiness, diarrhea, cravings for darvocet, insomnia, sweats, shivering, flu like symptoms, runny nose, sneezing, nausea, involuntary leg movements in bed.  One should have detoxed off Darvocet in a few days.