You might want to check out "Yogic Cure For Common Diseases" by Dr. Phulgenda Sinha. There's an entire section on "Sinus and Headache" as well as "Asthma".
Here's a link to download the book. Decide for yourself.
http://www.dailymotion.com/video/x5g4e35
P.S. I don't have sinus problems so I've never really used that part of the book. However, I have had friends over 40 years old who were able to get rid of their diabetes with the steps recommended in the book.