Welcome to the pain boards, from a fellow pacific northwesterner. Have you actually been to Oklahoma yet, or are you trying to find someone over the phone or the internet?
I think you might have better luck when you get there. Most doctors won't take you off meds you are stable on, and if they do, they will taper you slowly and put you on something else. But I understand not wanting to take the blind leap without knowing for sure.
What is taking you to Oklahoma, if I can ask? If you have friends or family, or co workers there, you might ask them to recommend someone, or there might be someone here from OK who knows a doctor. what town are you headed for?
Also, will you be looking for some kind of specialist, or just a primary doc? I really wouldnt worry if you havent found someone from here, a long distance phone call or an email asking if a doctor will prescribe narcotics is not usually something that gets a happy response, lol.
Good luck and I hope you can find someone soon and set your mind at ease.
Your Friend, Fabby