You really need to taper off it. I have had patients go into serious withdraw on doses much less than yours, and after a much shorter duration.I am not a doctor so I can't tell you what you should do, but I did find this onfo

iscontinuation: When patient no longer requires controlled-release oxycodone, patients receiving doses of 20-60 mg/day can usually have therapy stopped abruptly without incident; taper higher doses over several days to prevent signs and symptoms of withdrawal in physically dependent patients. Reduce daily dose by ~ 50% for the first 2 days and then by 25% every 2 days thereafter until total dose reaches 10 or 20 mg q12h. Therapy can then be discontinued. If signs of withdrawal appear, stop tapering, and slightly increase dose until signs and symptoms of opioid withdrawal disappear; begin tapering again, but with longer time periods between each dose reduction.Good luck!