Help - those last two milligrams per day of Subutex for pain control: How can I kick it for good?

I take 2 mg per day of bupeprenorphine, following spinal surgery. But I don't want to take ANY. Whenever I stop, the withdrawal leads to feelings of intolerable panic and sadness. More drugs ain't the answer (like, say, benzodiezepines). The Dr says "just taper even more gradually". Does anyone out there have any hints, insights, or relevant experience to share?