Sounds like an EMG/Nerve Conduction Study. I didn't like the idea either (and I had one many years ago that I had after-effects from for several days). I actually wound up having two for PN; one from each of two different neurologists. I wasn't terribly confident in the first test (or the neurologist for that matter) so a second test was done at the PN Clinic of the Neurology Dept. of a major Medical Center. Neither test was pleasant, but I felt more confident about the reasons for them being done, so I tried to relax and got through them.

There were some funny moments during the second test. It was administered by a young woman technician, and being the way I can be when I'm trying to relieve stress with humor, my wife was kinda split between falling out of her chair laughing and trying to keep the tech. from running out of the room...

It wasn't terribly different than using a TENS unit set to pulse & turned up too high...

Doc