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Forget the drugs.
Does it clear up when windows on both sides are open?
Then it's environmental.
1). Test your house for mold. Could be a small water leak inside a wall.
Use a moisture meter on walls everywhere there could be a problem.
Look for consistency on inner/outer walls.
2). Pet hair allergies. Vacuum everything with new filter.
3). Run a bit of water in unused bathroom drains.
Add bleach and run a few minutes.
P-Traps dry up and then methane sewer gasses get pushed back into the house.
The old-school cure for sinus problems was a towel draped over the head over a steaming pot of hot water.
Tea or lemon juice or eucalyptus or otherwise.
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Meanwhile other things are still happening.
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