Unfortuantly the only way to determine if there is a break is by xray. From your description it does sound a possibility or it may just be a severe sprain. As a painkiller I recommend ibuprofen 400mg three times daily. This is great for bringing down inflammation.
It needs to be said, that if it is a break then there may be no action required, depending which bones are involved. I would also give it some support with either bandaging or a sports support.
I don't think a visit to ER today is necessary, but it may be worth a visit to your doctor if you still cannot put your full weight on the foot tomorrow.
Does this help?
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