Flat feet and ASD

I have had lots of problems with my feet hurting dew to the flatness of them. I wear orthotics to help with it but they do not do a very good job. I tend to lean back and left all the time. I know this because I have wii fitness and the fitness board and it does balance tests and said that I am not balanced that i lean left and back. I am trying to work on that but the pain in my feet and it affects my knees and hips also so they are always in pain also as a result of me leaning left and back.