I've had numerous EMG's (4 I think). They really aren't bad unless you get a sadist. I told the first nurse who gave me one that when I told the story she'd be wearing leather with silver studs.
Each one was a little worse than the one before and I intend to ask not to have more. The first rurned up three anomalies but all the rest have been normal (or near normal). I'm told it's not unusual for the anomalies to disappear in RSD.