I have had Ketamine infusions ~10 times over the last 8 years as a outpatient part of a guanethadine Bier block. Not the most pleasant drug to use in my experience, unsettling is the way I would describe it. My doctor says that was the dissociative reaction to the drug..

On does it help with pain, I can say that it did allow me to go longer between blocks. But it did not cure me so I am not so sure I am keen to try it many more times...

Good Luck with your results...