Have you had the placement and positioning checked recently to ensure neither has shifted?
How long have you had the pump and catheter placed? Periodically both should be checked to ensure there are no kinks or blockages.
How soon are you planning on having the pump removed? I am unsure if the catheter can be removed since removing it would leave a hole in the spinal canal itself.. Has your dr said if they plan on clamping the catheter and leaving it, or how they plan to remove it?