sorry to hear about your problem..
Sounds like carpal tunnel syndrome to me...
I have it in both hands but its my pinkys that go numb,i wake at least 3 times a night having to shake my hands to get them to wake up,funny enough my problems started when i started sitting in front of a computer,i think its got alot to do with the way you sit in front of your computer,bad posture and leaning on your elbows for too long putting to much presure on the nerves that run through either your neck,elbows,wrists.
i suggest you go to your doctor as soon as posable about it,
because if your finger is numb all the time like one of mine was,
it means the nerve is becoming damaged and it won't be long
before your hand and arm start to become weak.
thankfully i got to the root of my problem as soon as i did or my grip would still be weak,but my pinkys still go numb at night
so mabey i need to try emprove the way i sleep,abit hard when you share a single bed with the girlfriend
hope you get it sorted soon....
DeeMaxx