Dancers: help! sore feet?

Hey so I've been dancing for 4 (almost 5) years and this week I'm taking a dance intensive at my studio. It's 7 hours a day and includes pilates, modern, lyrical, jazz, hip hop, and musical theatre dance. I left my foot undeez at home so during modern and lyrical I danced barefoot. After I was finished my feet were killing me. The calluses on my feet did nothing for me, it's as if they were ripped of my feet because it seems as if they aren't there anymore. I think it's the pirouettes that really got to me. Anyways, I know it's bad to dance barefoot, blah blah, but I really need to know how I can cure my sore feet because tomorrow I am going to die if I have to dance for 7 hours on these feet. Give me any home remedies you have or lotions I should try. Thanks!