It's true, my mom has sinus infection, and it happen periodical, especially when the temperature suddenly turns down. And each time, she will suffer headache and then the eyes get blurry. It's because of the inside connection of the organs. Your nose get infection, your eyes will easily get infection too, if your sinus infection didn't recover soon.
Here is my suggestion. First, take more vitamin as supplements which will help you to strengthen your immune system. The other thing is honey, which will help you as well, remember honey is so crucial to your sinus recovery. But the most important thing is exercise.
From my mom's experience, if you can insist to do that every day, you will be sinus infection free, but it's hard. Hope you can do that.