You're making yourself sicker because you're blowing your nose wrong. Yes, you can blow your nose wrong. A doctor in London says that when you blow BOTH nostrils into a Kleenex as hard as you can, you can shoot some of your mucus into your sinuses. And that could lead to a sinus infection.
So this means if you blow only one nostril you are better off than blowing two. Does alternating help? Blow one nostril first, then go after the second. In any case, how would one know which of the two should be first?--Penny Tucker