Things have really changed in the last few years as far as pain control. Almost no family Dr will treat a chronic pain patient, at least for very long.
You will have to have your Dr recommend a pain specialist or clinic. They will be the ones who can prescribe pain medication for you.
You can also find a pain Dr or clinic on your own but you'll still need your Dr to recommend you and you'll have to have copies of your records sent to your new pain Dr.