The pain you are describing must be very difficult for you. Some 15 patients out of more than half a million treatments given have reported severe pain with onset immediately or up to one week after the procedure. These patients all responded to the nerve medicine you mentioned, gabapentin or another in its class. However, this medication must be started with low doses that increase quickly, usually every day or two, until the patient responds. All patients responded to the pain mediciation, and all had resolution within two weeks, and, although you may not believe it or want to hear it today, all said they ultimately had no regrets after they saw the results.
Please review with your physician a second time that you have no contraindications to the treatment, especially cold-induced diseases or Raynaud's disease.