I didn't have the flu but I just got over a cold that turned into an upper respiratory infection and a double ear infection. I couldn't smell or breathe for days. Loads of fun! Lol. Hot, steamy showers helped as well as Advil Cold @ Sinus. I was up to taking three showers a day because that was what helped me most of all. Maybe try filling your sink up with hot water, put a towel over your head to block the steam in and try to take some breaths. Be careful to not burn yourself though. Sometimes that helps. I also used a gel mask that I have that you can heat up and put over your forehead and cheeks, where your sinus cavities are and that seemed to help too. I got it at Walgreens. Unfortunately though I just pretty much had to let it run it's course.
Good Luck and feel better soon!!!!!