Elevate it and take some ibuprofen tonight. Ice would also be helpful. If it's badly swollen tommorow then ice and ibuprofen and since the Doc/Er is free then go see him as soon as you can get your foot in a shoe. He won't be able to do anything other than what you described but he will be able to prescribe you better anti-inflammatories.

Edit: I agree with Jerkules- we said basically the same thing but he has more recent experience apparently.