Such nodes are commonly due to infection in the local area.In your case since there are throat symptoms possible cause is throat infection
.May be you can consider a clinical evaluation by ENT doctor.
Doctor would want to get few blood investigations and if needed swab from throat to confirm infection.
Doctor might also want to get a sonography
of neck done if he/she suspects it's something other than swollen gland.
Ear and throat are connected by Esthetician tube , so infections can spread either way.