I asked my dr if the pain I feel when my pills wear off and I'm due for my next does is because of withdrawl symptoms from my meds or because of rsd pain. He told me that the withdrawl symptoms from pills are different than those from the pain from rsd. What I had was pain from the rsd after my drugs wore off and I was due for more meds. Withdrawl from pain meds can include vomiting, chills, headaches, trouble speaking and incoherency. The pain from rsd can include swelling, redness of joints, burning or coldness in affected areas, intense internal pain in the muscles and tissues in the affected areas and limited range of motion in affected areas and disfigurement of rsd areas and spread of pain and physical symptoms. I've been through both, when the hospital I was in screwed up after my hysterectomy and didn't give me the meds I needed for my rsd. There is a big difference and they both stink. I just wanted to let you know my experience and what my drs have told me. Thanks.