Thanks for placing your query here.
I can appreciate your concerns.
The boy seems to be suffering from viral infection for last nearly 2 weeks.
In view of development of high fever
,there is possibility of having developed sinusitis
as a complication of upper respiratory infection
You need to show him to an ENT doctor as he might need antibiotics.
Hope I have answered your query.
If you have any further questions I will be happy to help.
Wish him speedy recovery.