Pain killers will just loose the sense of pain so you should go for the root cause of the problem. Sinus
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 may have to undergo surgery (drainage and corrective procedure) if symptoms persists.