Gee, I wish I knew about you ladies a few years ago...
MomOnBike - yup i've had a nerve conduction study too - because I grumbled to my neurologist (seeing him for then out of control migraines) about my thumb hurting. Thought he'd order an x-ray, but NO he thinks conductivity not structural, thus the study. Results, hand works fine, probably arthritis, here is some arthritis meds. Still haven't had that x-ray.

Maillotopois - I pinched the ulnar nerve in my hand on a long bike ride, didn't realize it at the time, but discovered the lack of function. Could wave "bye-bye" but couldn't do the "Vulcan hand sign" thing. Anyway we figured out I was riding in my drops too much and putting pressure on the side of my hand, the base of the pinky area. Doc (different one, and this one commutes by bike) gave me a wrist brace and sent me to my bike mechanic for another fit test & adjustment, and to have my handle bars corked. Got dubbed "witch blade" for a whole MS Tour training season thanks to riding with the brace, which kept me out of the drops.

So if you're riding, you might check hand position, and have your handle bars corked. Also maybe new riding gloves?

The rest on a beach wouldn't be bad either. Although until you figure out what you're doing to aggrivate the condition, and fix that, you'll need regular "therapy" trips .