For me on morphine from a bad 3- level fusion, only for 3-months. The doctor thought that oxycodone would be my bridge. No way ! After day two I wanted to die ! My wife called the morphine hot line and we were told , well get back on or three more days things should turn and did. I never will believe a doctor again about withdrawl unless they are a pain doctor. I did climb out of hell.
Still on meds. in lower levels and have a great pain team now.
Good luck :]