F.A.
I had depression and anxiety after my first baby and was first put on prozac. I found it helped with the depression symptoms (insomnia was the worst for me) but made the anxiety much, much worse. I came off it and onto Effexor which was much better - really helped me so much. My dad who is a doctor subsequently told me that prozac making anxiety worse is quite a common experience.
I had PPD after my second baby too and was told Effexor is now known to have some worse side effects (? heart issues I think?)and is not recommended for first line treatment so that time I was put onto mirtazipine and I have to say it worked very well too. Prozac was the only one that did not suit me but it is a very personal thing and I believe it works very well for some people.
Also, I found counselling in conjunction with meds was the best approach rather than just drugs alone.
I hope you start to feel better very soon.