How would I know if my sinus infection has gone to far?

For me I usually wait 2 or 3 weeks to see if things clear up or improve on their own. I try to drink plenty of fluids, eat healthy, take garlic which is a natural anti-biotic as well as vitamins to make sure I'm giving my body what it needs to fight off an infection.

Reason I wait is majority of sinus infections are viral and improve on their own as their isn't anything you can do for a viral infection except for wait it out. I also have heard a lot of buzz lately about how anti-biotics are overprescribed in general but especially for sinus infections. I try to avoid taking them if I can avoid it.