Sinus infections do not usually cause pain that require pain relief medicine. Therefore, referral to an ENT is very appropriate. This specialist can determine the reason for such pain and make sure there is no other cause than sinusitis.
I have the same problem, I just started a nasal spray today... But the side effects are terrible. Head throbbing, Dizzy spells, Headaches, Blurry Vision, Nasuea.
I'd say give it a week to work, that's wut my doctor said.