Maxillary Sinusitis: Greetings. Yes, chronic sinusitis can indeed cause fatigue, drowsiness and feeling like you are "in a fog". Our immune system is stressed with a sinus infection and thus is weakened. Over the counter saline nasal/sinus rinse 2-3 x/day the follow your evening dose with a steroid nasal spray as directed. This will help reduce inflammation. If after 5 days, your still ill, see your doctor.
Answered 4/11/2021
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