Thank you for the information. I am not trained in the medical field; however, I would label at least the blood patch as invasive, as I had the needle stuck in my spinal cord for at least 15 minutes because the nurse was unable to tap any blood from my arms.

The frame of reference is helpful. I am otherwise quite healthy and was active (trail running) until these procedures. I am lucky the pain isn't constant. I can only imagine how awful it is to have chronic, constant pain in the back and how debilitating it can be.