The world won't end if you don't finish the quilt on time and there will always be other anniversaries, God willing, so please let your sore finger heal in it's own time, it must be throbbing like mad even though it is seemingly numb at the moment and you should be wearing a sling!! Being a secretary myself, I know what it is like trying to type with sore fingers, so the index finger will take a few knocks and your livelihood comes first - in that sense you're lucky it wasn't the left hand because it is the left hand which uses most letters!!
Take care and try not to worry; you can always catch up on sewing with a few late nights if necessary.