If it has not been done yet, wash windows, change air filter, wash bed sheets and do this Wash pillow cases daily , hot steamy shower.
This one works everytime, get a wash cloth wet, put table salt all in it, breathe in thew the wash cloth, this will start cleaning sinuses..
Works for me each and every time , I bet you started heating your home, dry air will trigger this in a bad way, boiled water on the stove..