I believe the gabphentin is supposed to help with ghost pain do to amputation. However everyone is different when it comes to how your body accepts and reacts to the medicine. I would tell your doctor about it and see what he might suggest? Best wishes!
One avenue would be to look into what is known as "post amputation" pain. I would check this out: http://www.amputee-coalition.org/inmotion/mar_apr_98/pain_mgt/page1.html
And, then followup with the homepage: http://www.amputee-coalition.org
If anyone on this forum knows, please post the "type" of physician that would treat this, I cannot recall the name of the specialty for treating this.