It works for some people and not for others. And there are 2 main types of acupuncture- an adapted modern form practiced only by qualified doctors, and traditional Chinese method.
My OH was fascinated and chose to train, as an experienced GP, to treat some things with acupunture- and he did with great success, for joint pain, sinus, etc. He never used it for weight loss or stopping smoking etc. So who do you have an appointment with? There are also many pressure points you can learn to use yourself to relieve sinus problems. You could Google 'acupressure and sinuses' - can't do any harm.
Inhalations are still the most effective for most people.