I am a teacher, and stand on my feet all morning. By 12 o'clock. My feet are so sore and achey, I can barely stand. They feel heavy and cause me to feel very tired. On days when I don't stand on my feet, I feel fine. But if I walk a bit more than usual, (even if its a 15 minute walk) I feel awfully tired the next day. I am 35 and have been suffering for over 10 years, and it keeps getting worse. I am overwight but not obese. I have been to doctores who said I'm slightly flat footed, and recommended arches, but it didn't seem to help. (Or it helped for a very short time) What can I do to be able to function normally and take care of my family?