Tendon injury - by which I don't mean an inflammation, but probably a lesion, maybe it got partially or totally borken (if finger functionality is impaired, the lesion is very likely) go to the doc asap, because if you won't repair a possibile tendon injury within 48 hours, i am unsure whether you can do it ever again...
So, whatever you're doing no, you're doing the wrong thing. To the doc, my friend . or the ER:
now - not in a lil while
Only a scan may ascertain whether there is an injury indeed, but as said a tendon is something capricious that, if lesioned, needs immediate action.