Sorry to hear you’ve had a tough time with the standard one. A neuroradiologist (or at least some flavor of radiologist) should be doing the one under fluoro.So now they're scheduling me for, if I remember correctly, a flouroscopy guided lumbar puncture under general anesthesia.
/me went to Trestle today. Managed to crash a few times and give myself a likely hematoma in the hand with the last crash, whoops. Going to take a few days off the bike as it is quite painful