There is also a neti pot, which was demonstrated by
Dr. Oz on the Oprah Winfrey Show. Many people swear by
a neti pot, so it is apparently effective for some colds and some sinus infections. However, a neti pot flush may or may not reach the upper part of the sinuses. They are now widely available.
***BUT, before you try anything here, you should go to a doctor and have your problem checked out. You may have a problem that looks like a sinus infection, but is something else.