Hi Jirel,
When you get this pain, what kind of shoes are you wearing? I find that I need a shoe with a good soft insole to protect the bones from grating on each other. Dress shoes are a constant battle to find one that does not cause pain. I LOVE summer as the sandal type footwear often doesn't hurt as much. BUT, if I am going to be walking around a lot, I wear my Easy Spirit [atheletic type] shoes. Wearing a cushioned sport sock also helps.
Try to avoid "slide" type sandals with thin soles and higher heels and no back to the shoe. The act of gripping with your toes will often be painful.
Good luck, this seems to be one of the final frontiers of lupus that is not yet well documented or published.
Sally