I'm also in a battle with my doctors to get the most effective, and least damaging to my body, pain management for me. The pain meds I am taking now are very damaging to my liver. Also I find myself having to take more and more of them to be effective. Sometimes I think doctors treat their patients like geunia (sp?) pigs, and just keep prescribing different meds until one works, instead of really listening to their patients and finding something that will help long term. Well, that's how I feel about mine anyway!
But I think you have to be very insistent when it comes to your health, and even finding a different doctor if necessary. Because really, you're the only person in the world who takes care of you!