what's your room volume?
you can put purifier in your office room etc if possible
as for now, cetirizine hydrochloride, prednisolone and montelukast sodium, reltus DM syrup also, but prednisolone had a lot of side effects, weight gain and obesity, a lot of sweating and fatigue, now tapering it down and will stop it soon
I didn't research regarding that
actually, there are many, but in the end, it comes down to the severity of your symptoms, like in my case, situation is still 50-50