IF the sinus meds don't provide some relief you likely have some a problem requiring more than an OTC pharmaceutical solution; in other words, see a doctor.
My sinuses are kicking my arse right now, and the only relief I'm able to get is from OTC Claritin D. It's working for me at the moment. I needed the antihistamine in addition to the decongestant as I was having horrible allergy fits with my eyes, etc.
Allergies < *.