It is possible that she feels that when taken,
Zyprexa will dull the anxiety enough to help with the Valium
withdrawal but here in the US, this is not a typical benzo taper.
Why not ask her outright why she is prescribing this drug? Express your concerns and the contra-indications (heart health, stroke, renal health, diabetes, etc.) & see what her reasoning is? Also, is she tapering you off both Zoplicone and Valium at once? Some Drs. would want to do one at a time.