I was on Oxy over a year ago while doing radiation because my tailbone hurt so bad while laying on that hard table. Stupid me quit cold turkey on a Friday and I had one more treatment on Monday. I came close to going to the ER over the weekend I felt so bad. I had no idea I was in withdrawal until I talked to the radiation nurse and told her I couldn't do the last treatment because it made me sick. I told her I quit taking the Oxy and she said I was going through withdrawal. I had no idea you had to wean yourself off the drug. Lesson learned!