If your face is newly swollen I would go back. If there is a source of infection then drainage/removal of tooth might be needed to resolve the infection. As a poster above said, metronidazole might be added as its a good antibiotic for covering 'anaerobes' ie bacteria that live in deep seated tissue without the need for oxygen to reproduce. 500mg of Amox is usually adequate, I assume that is 3 times daily? Either way, with something like this, its impossible to advise effectively over forum.