@MajorHeidi I don't know about withdrawal symptoms, could be? I might start with taking your temp a few times today just to make sure you are not running a low grade fever? Can sometimes manifest as chills? Are you feeling well otherwise? Also since my surgery I have had an increase in menopausal symptoms, as if that were possible!! Hot flashes have intensified and accompanied by more chill flashes than I experiences prior. Might be due to my almost constant icing? If I'm not up walking around I am icing and elevated. I have read on BS the inflammation can be quite involved and can migrate down the leg. So I would suspect you fall into the range of whatever normal is after one of these surgeries. Are you keeping up with elevation and icing? If you do have a fever, swelling increases more and incision becomes even more tender, call your OS to be on safe side. I hope you warm up soon, maybe hot shower? And the Tylenol keeps you comfortable and still able to move.