I had been prescribed clonazepam for 20 years and I recently changed to a new mental health nurse who wanted to switch me to Xanax XR. I read articles and was reassured by her that I would have no withdrawals because it's extended release. I switched 9 days ago and on the 5th day I felt absolutely horrendous. Lived through the torture for 3 full days until the nurse told me yesterday to switch back to Klonopin. I have been back on Klonopin for about 20 hours, but my heart rate and anxiety are still not good. Is there a period of time that it takes for levels to restore to my normal?