Ketamine for lower back pain and depression

I have acute foramen spinal stenosis, neuropathy and depression.
My nurse practitioner is suggesting I consider ketamine therapy.
I am on Gabapentin 100mg, 3 capsules 3 times a day.
Celecoxib 200mg. , once a day and Duloxetime, 30 mgs. 3 capsules at night.
My depression is not improving, and I strongly dislike the side effects caused by the Duloxetine which is why I am very leery of any other depression pharmaceuticals.
Can anybody please give me feedback if they have been involved in the intravenous controlled clinic delivery of ketamine