If you have sinus infection - it could be VIRAL- antibiotics as Amoxicillin are indicated ONLY for severe BACTERIAL infection.
Headache, mucus, drainage is part of congestion better treated with nasal saline rinses, steam inhalation, hydration, rest... symptomatic treatment. Bacteria may be as well resistant since you used Amox too much in past! Consume probiotic rich diet to restore immune system
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