thank you for your query.
don't worry it is a very common occurrence.it is just due to the pressure of wearing high heels for 8 hrs.
just soak your feet in a warm water bath with sea salt for half hour twice a day for 3 days.also you can apply diclofenac
gel on the affected areas and if the pain is unbearable you can you analgesics for a day.
the symptoms should come down with rest in a day or two.
wishing you good health