I really wouldn't even waste your time. It sounds like you fractured one or possibly moer of those floating ribs. It really isn't looked at as that big of a deal, there is nothing they would do for you, not even prescibe you anything worth the trip. The 'rib belt' isn't' even recommended any longer. The only real damage that can come from it is if your breathing is effected from the pain to the point of respiratory alkalosis, but usually the pain and discomfort from the lung expansion is gone by the time that coulf happen. That's usually most common with fractures of the larger groups of ribs.
I would say give it another few days and if there is still no relief then go and get it checked out but no real need to now. If you start experiencing other symptoms other then pain, get yourself checked out.