Thanks for your question on Health Care Magic.
I can understand child 's situation and problem.
Your child is having bilateral enlarged
cervical lymphadenopathy.
And most common cause for this is upper
respiratory tract infection (URTI).
He is also having severe allergies. This can also lead to URTI.
So he needs antibiotics, antihistamines and anti inflammatory drugs.
Ask him to do warm water gargles 5-6 times a day.
Ask him to drink plenty of fluids orally.
He will mostly improve in 1-2 weeks.
If swellings are still persistent after 1-2 weeks than
consult pediatrician and get done
ultrasound examination of neck and fine needle aspiration cytology (FNAC) to confirm the diagnosis.
Hope I have solved your query.
Wishing good health to your son. Thanks.