So frustrated with my doctor!!!

Sadie
So I have been having an increasing issue with SPD (symphysis pubis disorder) that makes it super painful to walk, sit or do anything. My doc said to get a belly band which does help the pain. They also put in a referral for physical therapy. Here's my problem, I can barely carry on with my normal activities of daily living with out severe pain and crying. They told me to rest and go down to part time at work but I can't financially do that. One doctor in the practice said that it might be time to start my disability leave a few weeks early.
So I emailed my doctor about it. What does she do?? She writes a RX for Oxycodone!!! WTF!!! So in her eyes she would rather me drug my baby and have a baby born dependent on narcotics then to sign my disability papers!!! How is that even an option!!!!!! I want to make a complaint to the clinic administration about it. I am supposed to start my disability leave on 1/5/16 so taking me out now won't be a huge difference and it will allow me to rest and not loose my benefits at work. 
Any suggestion on what I should do???