Is one of the bones in my foot broken?

exactly a week ago today, i was out dancing. had heels on for the majority of the night, but i took them off cz my feet were in bits. anyway, about 2minutes after i took them off someone stood on my foot wit their heel!!! it was complete agony and i couldn't walk on it , it was so sore. its really sore to move and to put weight on too. i put ice on it when i got home and i have been since, i've also put arnica on it and have wrapped it in a bandage the last few days cz its been so bad. im wondering, is it broken and is there anything i can do to make it better by next weekend, cz i have a waterpolo competition next weekend and i need to be able to play well!