Damn. I had the same thing happen to me. Back in 2003, I got a tingling sensation in my pinky and ring finger. I lost power in my left hand and couldn't spread my fingers any more. Bending strings was next to impossible. A few weeks before I had stumbled on a stair with a heavy box and fell on my elbow. Apparently i had a fibroses that was pinching the nerve. Falling on my elbow seemed to have sped up the injury. So I had to have surgery in a hurry since it was deteriorating very fast. They moved my Ulnar nerve:
(BIG GNARLY PICTURE GOES HERE) I had to have three sessions of physiotherapy per week. But my best therapy was playing guitar. Even though it was quite hard at first, I kept playing. I met a guy who also played guitar and suffered from the same thing and he didn't play guitar whilst recovering. Afterwards he couldn't play any more. I'm still playing and after about a year( that's the time it took for the nerve to heal) I played better than before. So, as soon as possible, start playing and practising like hell.