Just like LL said not to underestimate your pain, don't exaggerate it either. Don't claim that your pain levels are at a constant 10 or even a 10 more often than not, because the doctor is not going to believe you. Be honest in what you can and can not do, what you hope to achieve with pain management ( not pain free- not going to happen if you have chronic pain).
Be willing to try what your PM recommends, even if you have already tried it before. He may have a different way of combining meds or suggestions that you haven't tried before. Be open to it. It might not have worked in the past, but as our pain levels fluctuate, you may find that a medication or therapy recommendation might work this time, at this point in your life. Don't discount PT or using ice or heat instead of pain meds at times or in addition to the pain meds.
Be open to suggestions of using electric stim or TENS units or other non invasive modalities in addition to the pain medications.
With the right combination of pain meds, and other treatments, you might be surprised at how some physical excercise , PT, TENs units, or other electric stim can be the right combination for you.