Oh man, that's bad. I am sorry for you! I may have gone into a pretty close to anaphylatic reaction from augmentin this week from sinuses, but now mine seem to be healing up (not healed, but much better) and I feel sad and guilty that you are still struggling.
If you can stomach it, try adding some garlic oil caps into your diet. Some people even make an extract of garlic and drop it into their sinuses, but I have never gone that far. It does seem to help fight infection.
I feel oh so sorry for the 2 of you.
My sympathies to the both of you-Knitting is right about the garlic-and if you don't like the taste of garlic, you can buy the odorless, tasteless caps. I cook with a lot of fresh garlic and I've been taking 4 or 5 garlic caps daily for years, and I'm convinced they help prevent infections-garlic is also supposed to be good for keeping your cholesterol and blood pressure lower. It is also good to increase your intake of vitamin C and other antioxidants during the winter months. End of lecture on natural infection prevention...