Hello and welcome to e health forum.
It seems that you have a persistent sinusitis, based on your symptoms.
You will need a consultation with your doctor for a prescription of antibiotics, for complete clearing of the infection.
In the mean time supportive medications like Advil, Robitussin-DM, and cough lozenges which will relieve your symptoms.
In addition, taking OTC immune supplements containing vitamin C, Vitamin E, zinc, carotenoids and omega fatty acids will be of help too.