Relli, can you contact the hospital again and explain to them that the sedation isn't necessary, that doing an lp is a simple procedure. See if you can find out who the doctor is they are planning on using and see if you can find out what the story is, I wonder if this is their first and so they don't know what to do??
I agree, while they are dinking around you are suffering, and that just is not right. I'm pulling for ya!