Well, if the only doctor who will give you
anything requires a contract, then sign it. Good pain management might also include for YOU to keep track of your pain, and your medicating. If you go into the doctor with a booklet of your taking the medicine as prescribed plus the notations of when you did such and such activity and had breakthrough pain, then the doctor might be more open to increasing your medication for those times, you know?
If the doctor sees you taking this as a serious, sincere effort to reduce your pain, they might overlook what they think they see as drug seeking behavior.
be well