I work as an orthopedic physical therapist, and see a lot of foot injuries related to improper shoe wear. My advice to you would be to get the best pair of running shoes you can. I would go to a good running store where they will watch you stand, walk, and possibly run, and put you in a shoe that is designed to support your foot type. Don't just go to a Foot Locker and buy shoes. A running shoe will give you the best combination of arch support and cushioning that will aloow prolonged standing with less pain.