Sometimes otherwise unexplained numbness in the extremities represents the constriction of muscles over nerves at a spot closer to your trunk (like at the neck for example). If hypertonicity in those muscles continues, the numbness may spread and increase in severity. There are options to relieve this hypertonicity including icing, stretching, yoga, massage therapy. I would probably start by icing the neck first just because it's the easiest (and least expensive) option. If you go with stretching or yoga, it might be a good idea (especially if you don't already do these things) to ask for help from a trainer or instructor so you don't cause any damage. If you opt for the massage therapy, please be sure to go to a therapist who specializes in more than "relaxation" massage. Swedish massage has very definite therapeutic value, but for your situation, you might be better served to see someone who knows more about referred pain patterns. If it was me, I would start with someone who works in conjuction with a chiropractor or at a wellness center and I would be sure to describe my situation over the phone before booking an appt.
best of luck!