Unfortunately, this is a difficult decision. I guess the question I would be asking myself is did I get any relief from the Ketamine? How long did it last? If I did get some positive results I would try it again if you are allowed to do it this early.

A pump can give you some could relief as well but it is not a cure.

Just a suggestion, post your thread also on scs/pain pump site. They can possibly give you more details into the painpump issues.