Even after getting tonsillectomy
if you have recurrent sore thraot then it shows that youmight be having---
or reflux disease
You should not blow your nose as middle part of ear and back of nose are connected and becausde of blowing you will send infections to the ear.
You need to take antibiotics so that the infection is controlled and in addition decongestants (which you are already on).Take nasal decongestants also like xylometazoline
drops in nose .
in doubt do reply