I'm 4 months pp and a waitress, even on slow nights just being on my feet for so long makes my…

I'm 4 months pp and a waitress, even on slow nights just being on my feet for so long makes my hips/knees/lower back hurt and I mean it is so bad that I could burst into tears! Anyone else experience this? Any natural remedies? I don't take pain medicine. I'm currently laying on a heating pad hoping that helps 😕