Hi, thanks for writing to HCM.
You need a detailed clinical & radiological examination to assess the severity of your foot deformity
Momentary pain relief can be obtained by using over the counter pain medications like advil
. You can also use specially designed shoes with good soft padding inside them & medial arch supports for your flat feet.
I feel that permanent solution for your painful disfigured foot would be surgical correction either in the form of osteotomies or arthrodesis
Consult an orthopedic surgeon for a detailed evaluation and further management.
Hope this information is helpful. Good day