Thank you for the query. You haven t mentioned your age and gender. If you are convinced that you are having a sinus headache, the best medication in that case would be Paracetamol (Acetaminophen) - 500mg tablets (but not more than 3-4 tablets a day, assuming that your liver functions are within normal limits). You can also use decongestant nasal drops like Xylometazoline (commonly known as Otrivin), to relieve the nasal congestion. Steam Inhalation also helps. However, I would advise you to get a X-ray, Paranasal Sinus done, because if indeed you are having Sinusitis (infection of sinus), you may need a course of antibiotics, after consulting your physician. Hope this helps you out.