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The causative agent may not be necessarily air borne - in can be ingested!
Is there anything new? - pets? carpets? / or something old meddled - air conditioner?
The diagnosis and treatment are proper indeed! It may be a question of time only.
They run their own course - with time, the body develops blocking antibodies
and they may disappear.
If it is very troublesome and interfering with life style, a short course of oral STEROIDS
may be tried - but they have their side effects and hence the hesitancy. Or DE-SENSITISATION may be tried – they are cumbersome, costly and not guaranteed
A different anti-histamine
may be tried.
It may be combined with a leukotrine modifier like Montelukast
Wishing you speedy recovery