Thanks for the concern
seems to be a sorethroat/ tonsilitis
cause when ever there severe infection it leads to lymphnode enlargement and pain. this lymph node pain will subside only after the infection is cured. So consult an ENT doc for examination of throat/ tonsil to rule out the inflammation and for needful therapy.
Till then start warm salt water gargling.
Sometimes even TMJ
inflammation also causes enlarged and painful lymphnodes
of the said region.need to consult dentist
for treatment of TMJ.