Pdoc wants switch from Celexa to Pristiq to help anxiety

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I had been taking citalopram for about 6 years before a reaction lead me to discontinue it and I ended up on benzos.  I was gradually able to reinstate citalopram while going off of benzos.  I'm at over 6 weeks off and am still experiencing terrible anxiety, akethisia and agorophobia.  My pdoc wants me to switch from Celexa to Pristiq with almost no cross-over.  Any thoughts?