Antibiotics are unlikely to exacerbate the sinus symptoms, and it sounds like your son is suffering considerably. It may be that he has a mild immune deficiency and cannot fight off normal sinus bacteria. It sounds like you have exhausted all the surgical and medication options and still the problem continues. Ask the doctor to do a full immune screen such as looking at Immunoglobulin levels (IgA, IgG, IgM and IgE), plus antibodies to common bacteria (Streptococcus and Haemophilus) and gauge how well his immune system is functioning
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