SIR MY CHILD IS 15 YRS OLD .HE IS SUFFERING

SIR MY CHILD IS 15 YRS OLD .HE IS SUFFERING FROM HEADACHE FOR THE LAST 3 DAYS ON FOREHEAD AND NEAR THE NOSE BRIDGE & OVER THE HEAD.MOREOVER PAIN IS MORE DURING BENDING FORWARD ARE COUGHING.IS IT RELATED TO SINUSITS?HE IS ALLERGIC & SNEEZES DAILY IN THE MORNING OR NIGHT.
WHEN CONSULTED ENT DOCTOR HE GAVE MOXIKIND 625 & IBUBRUPAHNE& NASAL DROPS.. BUT PAIN NOT SUBSIDING. IBU BRUPHANE IS GIVING ONLY 2 HRS RELIEF.HOW LONG IT WILL TAKE TO GET RID OF PAIN.IS IT CORRECT MEDICINE?