Hi ! From your history, it seems that you might be developing varicose veins
of the foot, which develops due to your standing all the day on your foot. This can be diagnosed by a clinical examination by your family physician/surgeon. Till that you can go for pressure garments which are made to order for your foot. You can enquire about it from your local chemist who may be having idea about the agency who may make it for you. Keep your feet elevated whenever you are free. If this increases, then you may have to go for some surgery. If possible, I would suggest you to avoid standing for prolonged periods
as a preventive measure. Take care.