yeah i have pretty bad dust allergies myself.
i sniffle and sneeze constantly throughout day and night no matter where i am or what i eat/drink.
do you find it's worse indoors or outdoors, what time of day do you notice it most, what room of the house are you usually in when it's bad, etc. keep track of these things for a couple of days to help you better understand what might be causing it.
if it's mostly in the morning when you wake up in bed, maybe you're allergic to dustmites. wash your sheets, pillows, and blankets, and try running the vaccum over your matress on both sides and if it's a boxed in wooden bedframe like my old one was there may be dust collecting between frame and matress, vaccum that area as well. you might also want to dust the frame and headboard as well as any furniture or wall hangings around your bed, and vaccum/sweep underneath the bed. see if that makes a difference.
this is stuff that should be done ocassionally anyways in my opinion, because if you're not allergic now you could develop an allergy from prolonged exposure to dust and/or mites.
eta: i also find my allergies worst in winter because the windows and doors are always closed, so i'm breathing recirculated air constantly, sometimes when my allergies get bad i take a walk outside and it fixes me right up. as long as you're not allergic to pollen in which case that may not help
I'm singin' here to get rid of fear
Hope it disappears right here with the rain
But I know life is pain, not like a fairytale
Meaningless to pray, so just goin' on my way