Sinusitis has symptoms like feeling pressure on forehead, sinus drainage, fatigue, poor sense to smell and taste, bad breath, sore throat
, ear pain
etc. You need to undergo detailed evaluation and rule out deviated nasal septum, blocked sinus, presence of foreign body etc.
You should take rest; drink plenty of water, salt water gargle. Antibiotics, antihistamines, cough syrup will help you but to be taken against prescription.