I am not a doctor (obviously as I am asking a qestion in the forum) though I have an idea. It could be carpal tunnel syndrome. Here is a website that offers some treatment guidance:
http://www.ninds.nih.gov/disorders/carpal_tunnel/carpal_tunnel.htm#Is_there_any_treatment
Initial treatment generally involves resting the affected hand and wrist for at least 2 weeks, avoiding activities that may worsen symptoms, and immobilizing the wrist in a splint to avoid further damage from twisting or bending. Nonsteroidal anti-inflammatory drugs, such as aspirin, ibuprofen, and other nonprescription pain relievers, may ease pain. Cool (ice) packs and prednisone (taken by mouth) or lidocaine (injected directly into the wrist) can relieve swelling and pressure on the median nerve and provide immediate, temporary relief.
Just an idea that may help. Good luck.
-Bill