Usually Prozac is considered one of the more stimulating of the SSRI's. Paxil usually is less stimulating and can cause more lethargic side effects or is neutral. Lexapro has the fewest side effects in most studies. The main thing about Prozac and Paxil are their half lives.So, basically the longer the half life, usually the easier the w.d. Prozac has the longest half life of all of the SSRI's. I am sure your pdoc/doc is doing a slow taper

Heres a good paper on it:
Selecting a Selective Serotonin Reuptake Inhibitor: Clinically Important Distinguishing Features

Antidepressant Comparison Chart

https://www.google.com/search?q=char...rticle_pr%2525

http://www.oncologypractice.com/co/j...s/0206528t.pdf

Basically if you just do a slow taper. You should be fine. Your pdoc will probably want you to wait a few days between discontinuation and starting fluoxetine. So as, to prevent serotonin syndrome.
All of this needs to be handled with your mental health care providers with a slow taper. You shouldn't have to much of a problem, IMHO.