In reply to diddler:
Flexor tendon strain (possibly)
Test: Place hand face up on table and hold down finger, try to flex.
Time: Faster than a pulley injury, but maybe 2 months till it is back to strength.
Cure: No more climbing till it is much better, ice it regularly with water. The worst thing you can do now is make it worse. Accept your fate and deal with it.
Expertise: 3 of these injuries (or something that sounds similar)