How long did the numbness last?

Doxy has anti-inflammatory properties, and is sometimes (or was in the recent past) used for carpal tunnel issues.

You can test yourself for Tinel's sign by tapping the underside of the wrist with a blunt object (wooden spoon or butter knife flat side) If you get tingling there going into the fingers you might have carpal tunnel. You can google Tinel's sign on YouTube to see illustrations of various joints where it occurs because of compressive issues.

Taking Doxy every day though orally may cause Candida, as the therapy time continues, and this will cause some nerve problems in some people as a side effect. Usually it would be bilateral though not just one place. One wrist suggests a local process or overuse or bending the wrist while sleeping.