Then that COUGH may explain the enlarged lymph node! Coughs can last for months! I had one that would worsen every 2 days! (NO other symptoms, not even feeling sick! And I am a person that NEVER gets a cough) After 2 months I went to a doctor (she gave me one of those things to stop the inflammation of the bronchial tubes and some mucinex and it went away - had it from February to May! (She thinks it was allergies, that was in 2004, never happened again) - but even an allergy can enlarge a lymph node.