I had surgery a couple weeks ago to have a pelvic mass removed. The gave me instant release oxycontin 15mg every 3 hours. I came home a week ago & they gave me a prescription for the oxys. I decided to stop taking the oxys because I didn't have pain anymore. I started having terrible withdrawal from the oxy pills. Shakes, vomiting, diarrhea, sweating, can't sleep, can't eat. This went on for about 2 days. Well, I gave in and took 1 oxy pill.