Is there a medical school in your area, or another state close by? Another way to find docs that manage drug delivery systems is the manufacturer, in my case it is Medtronic they have a list for your state and nationwide. Look on their website and also other manufacturers of pain pumps.
I know it can be difficult to find somebody who does the work and seeing if they'll accept you. I had to have a clearing by a psychologist and a trial for a week. For me it is the difference between being part of life or a prisoner home bound with pain. I hope you can find what you need. Good luck.