Our expert says:
Mal, the antibiotics will only work if the cause of the sinusitis is indeed an infection. Your GP was clever and tried to cover for allergies too by adding an antihistamine (Clarityne®) to the mix. This now seems to suggest that it isn’t due to sinusitis and that further investigations need to be done. You can of course try taking a combination of a painkiller and an anti-inflammatory just in case it is due to a tension type headache. Good luck.
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