i've done all the ergonomic crap and it still hurts, a lot!  but then i also have a bit of carpal tunnel from work which makes all that repetitive stuff worse.  try standing with two soup cans (or something of similar weight), one in each hand.  bend over like you are going to touch  your toes and let your arms hang.  now gentle 'write the alphabet' with both hands.  i do this about 5x a day.  great wrist loosener and breaks up the repetitive movements.  good luck!