You're asking all the right questions, smurff.
I'm not a doctor, I've had RSD for about 28 years, and have been around here for a while too. I don't know the dangers or the forms of ketamine. (I've never had it).

The danger of surgery with rsd, is that it can spread. And, it will. Even over time.
Imagine your entire body feeling that way? Mine and many others do. We call it 'Full body'.

So, get your questions answered, and find out if you do indeed have RSD or not.

I have rsd, and neuropathy.
Often for some additional pain control (besides the meds) you may need to 'fool' your nerves. Try putting your feet in some luke cool, or warm water. This will be enough to 'change' what the nerves think they are sensing, thereby deactivating them and reducing the pain. If that's understandable? Are you getting any odd sensations anywhere else besides your legs?

Be Well!!

Pete
asb