If your sinuses are blocked, get a blend of different respiratory essential oils, like eucalyptus, pine, niaouli, ravintsara (try pharmacy or healthfood store). Then you add some drops of the blend (i trust the manufacturer's recommendations for the precise dose) and dilute in boiling water.
Either you use a basic bowl with a towel over your head, or you get one of these :
You can get one at the pharmacy, it's inexpensive and useful.
In your bedroom or even living room, think about humidifiers to hang on the radiators, fill them with water and i like to add a drop of that essential oils blend. It creates humidity in the room, i find it helps with respiratory issues.
In aromatherapy you can also find atomizers, which are really neat.