Hi Neha Pant,
Thanks for writing your query.
After reading your post, it seems that your son is having viral fever
Viral fever takes its own time to resolve. Antipyretics can be given like Paracetamol
to decrease the discomfort caused by the fever. If fever is associated with bodyache, Paracetamol with ibuprofen
can be given (Ibugesic
It is good that all the blood reports are normal.
Blocked nose can be relieved by use of Nasoclear nasal drops, which are safe to use for long periods. Get him examined by a Paeditrician and give medicines under medical supervision only. Ask him to take proper rest as this helps in faster recovery.
I hope this is helpful to you.