Medical Induction or Castor Oil

So my doctor wants to induce my big boy next week.

And I really want to avoid that... (I'm 38 weeks with Gestational Diabetes.)

Should I just drink castor oil and try to induce him myself? I've literally tried everything else. Sex, walking, acupressure, pineapple, spicy foods. You name it I've tried it. All that's left is castor oil.. any advice?