was on Effexor xr for 9 years but it never really stopped my anxiety. I am now on Prozac. Was on 30 mg for 8 weeks and had to go down to 20 mg because of really bad headaches, libido issues and serious diarrhea. now I am feeling the anxiety come back a bit. doc is saying I should add another med. which one should I consider. I asked my doc and she is thinking of switching me to Pristiq