Dave, yes he's tried Vaseline around his nostrils, and also Beconase.
He has shelves stacked with products, poor chap.

The main problem is that Africans have very short, wide nostrils extremely well-adapted to their hot climate. Air can be drawn in easily, unlike Caucasian noses (especially Scandinavian ones) which are quite long and let the air warm up before it reaches the lungs.

So in his case, air goes zooming in straight through his nasal passages without let or hindrance. Pollen isn't filtered, and of course his body had never encountered pollen in his home territory.

His sinuses become very painful too, which leads to headaches.
He's very stoic though, and soldiers on regardless. (I'd be moaning my head off if it were me!)

My vertigo was very debilitating. I'd be vomiting for England and everything would be spinning round. Visually it looked as if our bedroom was turning. Four days of this and I was at the end of my tether.
My sister thinks it's a kind of vestibular neuronitis. But thankfully, abstaining from delicious blue/runny cheeses and dark, strong chocolate :( has prevented any more episodes!