It may take a while for the feeling to return. I was wondering if you were taking anything such as Topomax or Neurontin for the pain. Those meds are supposed to help the nerves stop being so over-reactive, since they were surprised by a scapel about 3 weeks ago.
I had sensitivity in my wrist after surgery. Even the AC blowing on the wrist hairs made me feel like someonw was holding a match to my wrist. The meds helped calm it down, and now, I can wear a watch without a problem.