When I sit down for any amount of time, at least 5 minutes and get back up I can barely walk. My feet hurt, my whole foot both of them and I can barely put weight on them and they feel kind of stiff when this is happening. I have asked the doctor and they didn't do any test but said it was because of being over weight but i have always been over weight my whole life so i don't know what is wrong with them. i really feel like i'm old but i am only 27 and once i stand up for a little while i'm fine. so what could this be? And I am a stay at home mom so I'm not on my feet at work all day or anything.