Hello, The most likely cause for such a pain in your foot seems to be due to diabetic peripheral neuropathy. Prolonged standing and associated VIT B 12 deficiency might be contributing to your symptoms of foot pain. You must consult your doctor and get proper physical examination along with other relevant investigations like nerve conduction studies along with arterial and venous doppler of both legs and VIT B 12 estimation. If VIT B 12 deficiency is found then take injectable VIT B 12 for 7 to 10 days after consulting your doctor. If diabetic peripheral neuropathy is diagnosed then treatment involves Tight blood sugar control Anti seizure medicine like PREGABLIN Anti depressants like DULOXETINE Opiods like TRAMADOL etc. Thanks