I'm sorry to hear that your RSD has not responded to the treatments that you have received. I too have tried every treatment in which none provided the longterm relief I was looking for. Also, I totally agree about shying away from procedures that are invasive to prevent spreading as I learned that lesson the hard way after having the radio frequency nerve ablation causing the RSD to spread.
There is a list on this forum called Ketamine List and it has specific doctors that are using the above as a treatment for RSD. That thread might assist you in finding the treatment you are looking for.
Thank you for joining the group as it truly has members that are armed with a wealth of information and they are always so helpful and caring.
Sarah