I think you had a stroke.
Not really, but about 4 years ago I had a killer headache for a few days and my left hand cant type for squat since. Guitar playing did not change, but you really wouldn't notice that difference anyway.
See a doctor. They may be able to alleviate any Carpal Tunnel or other issues with simple anti-inflamatory meds like Naprosyn or Ibuprofen and maybe some kind of a change in routines. Sure beats waiting until surgery time.
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