I know someone who was helped by putting arch supports in his shoes.
Hi and thanks for using the forum.
Your knee pain is most likely from standing on your feet all day. Long episodes of standing can put pressure on your knees, hips, ankles and feet. Make sure that you are wearing comfortable, supportive shoes. I know some hairdressers/barbers that have a cushiony mat that they stand on behind their barber chair so that it absorbs some of the pressure on your legs. You could try taking acetaminophen or ibuprofen for the pain and if it is really bothersome, you might want to see you doctor if none of these ideas work. Good luck.
Bridget