Hmmm, it must have been very deep to have a stitch put in it redfan. OUCH ! Fingertips are obviously very sensitive and deep cuts through the thick flesh tip of a digit will take ages to heal fully, but is it open (not covered with a plaster?) - if it is covered, you need to get air at it - suggest leaving it uncovered and bath in warm salt water as often as needed - this will promote healing and stave off infection, should also take away the soreness, it does sound as though you have a slight infection considering the pain you are having with it after this time....keep bathing the wound and it should be ok.
RQ :)