Could swollen lymph nodes be cancer?
Cancer can cause swollen lymph nodes, but I doubt that this is what is causing your problems. It sounds like you had a sinus or ear infection that was causing your lymph nodes to swell. Sometimes, it takes awhile for the lymph nodes to return to normal, even after antibiotics, so see how it goes. It should definitely be gone by next week, so if it is not, you may need more antibiotics.