Thanku for your query.
Well I understand your concern,URTI that is upper respiratory tract
infection are quite common in childhood,and it is mostly viral in nature .As u said your child also has sinusitis
episodes headache are quite common with that especially on bending.stomach pain is also sometimes associated with URTI .
For this u need to take special care like giving steam inhalation regularly especially during infection episodes,plenty of fluids especially lukewarm water .avoid giving sour and cold
things in diet.give healthy diet containing good amount of proteins ,fruits and vegetables so that his immunity pics up.avoid giving food from outside,candies and the items which contain colouring substances .
Right now give your child montelukast
and levocetrizine regularly at bedtime for three months .steam inhalation and home remedies
like ginger and tulsi leaves.it works well
I hope I have answered your query