I have been suffering with CP for 15 years and have had an intrathecal pain pump for about 8 years. I have had a Spinal Cord Stimulator for about 10. Several things about your post alarm me in reference to your PM doctor, and even if it means you have to travel, I would strongly recommend that you get another opinion or better yet, switch doctors.
First of all, no doctor should be "bullying" you into having a pain pump implanted. They are not by any means a "replacement" for oral pain meds, and I do not think that a pain pump is even indicated for the type of pain you are suffering from. As Straydog said, they are for people with back/spinal pain who have exhausted all other forms of pain management.
My pump was implanted for pain at L5/S1 and L4/L5, and over the course of time other discs in my spine have degenerated and herniated, and my doctor has explained to me that the pain meds don't "travel" up and down your spinal cord, they pretty much stay in that localized area where the cathetar is placed, so I do not believe they would be useful for any other kind of pain.
You may want to talk to someone about a Spinal Cord Stimulator - they can be used to relieve pain in many areas of the body from the point of implant in your spine down to your feet.
Both of these devices have pros and cons, and most doctors do a several day trial to measure how successful the devices are at managing your pain, and your input is vital and should be taken very seriously.
Most people with these devices, myself included, must continue to take meds for breakthrough pain as well. For a doctor to try to force you off of oral meds that I assume are managing your pain (otherwise you would not want to stay on them), is scarey and I think you need to run (not walk) away from him. I know it may mean some traveling on your part, but a good pain management doctor is worth it (I travel 2 hours each way to see mine). The fact that he would even suggest this makes it obvious that he is not knowledgeable enough about pain pumps or the medications that go in them, and for a pump to be a success, the doctor MUST be knowledgeable in both areas! The doctor plays a huge part of whether a pain pump is successful or not.
My intrathecal pain pump is in need of changing (the battery in them lasts about 6 years), which I am having done on Thursday, so I will be hit and miss on the forum, but if you have any further questions or concerns, please feel free to post them and either I or one of the other members with a pump will be happy to answer them.