Essential oils can help alleviate discomfort from sinus congestion, sore throat, and cough. Essential oils are known for their antibacterial and antiviral properties.

Inhalation for Sinus Congestion
Place the folowing essential oils in a glass dish filled with steaming water:
1 drop Eucalyptus essential oil
1 drop Myrtle essential oil
1 drop Tea Tree essential oil
Drape a towel over your head, close your eyes to avoid eye irritation, and lean over the bowel and inhale the fragrant steam through your nose and mouth. Keep the towel over the bowel to trap the steam and essential oil vapors for inhalation.

I have used a similar recipe the only difference was, I used Lavender instead of Myrtle to relieve sinus congestion. Place the drops in a bowl of water (I prefer distilled water), soak a wash cloth, wring out, place over the sinus area (eyes, nose, cheeks), for 10 to 15 minutes.
KWG

I have used this and it works great for me.