Uh ... once a year “sinus infection?” And no fever / exudate / tender lymph nodes / other signs of infection, I presume (since your doctor didn’t want to give you antibiotics). With almost no information available, that sounds like an allergy, not a bacterial infection.
More to the point: if it is not a bacterial infection, then antibiotics not only won’t help you, but they will make the problem worse for everyone else, by encouraging drug resistance. That’s not an opinion; that’s the simple fact.
Again, I’m going off just what you posted, but it appears that you may have an allergy rather than a bacterial infection. If so, you should treat it like an allergy, rather than like a bacterial infection. You, and everyone else, will be better off.
I don't go to the doc until I am beyond repair, and I've lived long enough to know whether the once-a-year infection is viral or bacterial.
When I go to the doc, tell and display my symptoms, I just want whatever it takes to knock it out.
I don't want a lecture about guns in the house, smoking or whatever, I just want whatever is bugging me to go away.
If I have to go to Mexico to buy a truckload of Keflex, so be it.
I'm just not in the mood at the time to put up with the crap when I know what is wrong.