Hi, welcome to the forum, your symptoms are suggestive of acute bronchitis and
cough. The probable pathogens are Influenza
virus, Mycoplasma pneumoniae, Chlamydophila pneumoniae and Bordetella pertussis.
Other possibilities of neck mass are Reactive viral lymphadenopathy, Bacterial lymphadenopathy or Noninfectious inflammatory disorders like sarcoidosis, Kawaski's disease which is connective tissue disorder which can be a part of your former disorders.