Neck lymph nodes can be the result of tonsillitis, pharyngitis (infection
of upper throat), infection
in mouth, caries in tooth
, internal ear infection, outer ear infection, eczema, dermatitis, dandruff, breast cancer, fungal infection, other cancers like lymphoma etc. If you had flu like symptoms initially then it could be due to infectious mononucleosis too. So if streptococcal infection is ruled out then this should be looked into.