same same take this also with a grain of salt...
im using air humidifier..to sleep..heheh lavender works wonders but most likely air purifier would work better...except its also more expensive.

ive got sinus issues too not so sure about that the dust mite thing but the eye itch usually its dust...

Your environment is important ...make sure its not dusty...cause dust will trigger the leaking nose n the itchy/puffy eyes. This is personal experience la..
the most crucial is to fix environment make sure its CLEAN, which is like make sure all the shelves clean weekly / best if keep minimal stuff around so the surface u have to clean less. if not clean till u pengsan..
then air the room dont leave it all stuffy...clean sheets...blanket...
clothes, towel all got to jaga also..if wardrobe all not like close n has dust will easily trigger..

weather/ temperature..suddenly hot then cold also nose like pipe bocor..

true ...but if the basic stuff of cleaning not manage same one..it can only do so much those machines..
also ive seen a client doing coway open up the machine..some like sharp the filter inside smaller n dunno which other...
but m not here to promote any brand la..which every brand firstly easiest is to manage the environment.

If got furry pets le..can go bang the wall liao...confirm need air purifier..
sinus n pets dont get along much

ive tried that but now trying another brand melaleuca..still cant decide which i like better
but does essential oil help with sinus..sleep yes la..

which ? i use lavendar for sleep which is good for sinus?