This is a very sad situation. I imagine that you have had your pump output adjusted upward a number of times. Did you ever receive any pain relief from your pump? I am in a similar situation. I had my pain pump implanted just over a year ago. It has never given me any pain relief. Even after being adjusted upwards more times than I can remember. I have buttock pain from a fall eight years ago. No treatment, including spinal cord stimulator and pain pump, have reduced that pain or the feeling of sitting on hockey pucks. No one can explain it.
Please don't give up. Have you had an MRI? That should provide some insight as to what is causing your pain.