Your tapering program needs to be medically supervised or you may suffer convulsions and/or death. It took over a month for me to wean off of Fentanyl and my dose rate wasn't as high as yours. My entire phase out was scripted by my oncologist and I still had withdrawals, although nothing unmanageable. (just for the record, some cancer patients I have known personally (pancreatic cancer mainly) have had a 500mcg dose rate - and that's the limit)