I've been on Xanax extended release 1mg twice a day for about a month now. I have panic disorder and was wondering If anyone had previously been on Valium and switched to Xanax er, and what their experience has been. I still get bad anxiety and sometimes panic attacks and I am wondering if its anxiety from switching from something I had been on for years (Valium) to the Xanax ER I'm considering going back on the Valium , but feel I haven't really given the medication a chance to work. Anxiety and panic disorder is a tricky thing. Any feedback or suggestion?