I think it is hard to say.

Nitrous oxide... will affect nerves in one treatment.

But midazolam is a benzo... and those aren't typically hard on nerves. The benzos will have a anti-spasm effect, which may translate into soft muscles...but I would not expect one sided or only one limb. I would think all would be affected to some extent.

I am thinking it is a compressive thing. So many people have compressive issues, after surgeries. Just lying on your back may compress one side of your spine just enough if there were subtle problems there to begin with..

Midazolam does interact with other drugs however...so typing into a drug checker with your other meds would reveal that.