I am also crossing over to Valium from Xanax, but Xanax XR.
Is this correct that you have completely stopped Xanax and are just taking Valium now 10mg 4x daily? If so, this is NOT good! I did this a few years ago and failed miserably!
Start with just switching the evening dose of Xanax to Valium and hold for 2 weeks. So take .5mg Xanax in the morning, .5mg afternoon and 10mg Valium at night. Then once you are stable on that, do the same for the afternoon dose for 2 weeks, then the morning dose. You need to slowly cross over to Valium. Then once you are stable on the Valium, taper 1mg every 2 weeks.
That is how I am doing it and how my Psychiatrist recommended it. Of course, this is not the only way to do it....you have to do what works best for your body. Read the Ashton Manuel again for crossing over from Xanax to Valium. She doesn't recommended you just stop the Xanax, but gradually cross over.
I wish you all the Best in your taper! I am right there with you!!