I am asking for a good medecine for sinus?

Rhino-sinusitis. The question is not "what is a good medicine for sinus"? But what is your true diagnosis. The answer to your question is what is the diagnosis. True infections of the para nasal sinuses (there are 4 of them) are almost always preceded by a viral or viral/bacterial infection of the nose and then proceeds into the adjacent sinuses. Thus you need to know the cause of your problem.
Saline washes. Use "nety potty" to cleanse nasal cavity, take guaifenicin (mucinex) and consider an anti allergic med such as zyrtec, Allegra or claritin.