Have you seen your doctor? This could be an allergy, a sinus infection, or a whole variety of other issues. Have you had covid? A lot of people who've had covid report symptoms like this after recovering, even if they didn't have them while they had covid.
I wouldn't be terribly concerned, but I would definitely see your doctor. Any symptoms that last this long, or include breathing difficulties, need to be checked.
Let us know what happens, and I hope you get some answers so you can feel better soon.