What's wrong with Drs?!

So yesterday I called for the dr who wrote savella for me to give me a reg script because it was working and my PA called back and said she would write it and to take one a day and if it doesn't work to take two.... This isn't something like a pain pill. It has to build in your system to be affective, why in the hell would I want to go backwards if this is working fine. I am on the normal dose and she wants to cut it in half? Geez