Oh, how I feel for you. It is so hard watching your little one sick. I am not a big believer in Meds unless necessary, so here is what I do. I do the same for my 7mo old, and my 3 yr old. I use a humidifier, and turn off the fan in the bedroom while they sleep. I also use a saline/water spray in their noses (yes, they hate it, but so worth it). I warm it in a bottle warmer, and then hold or have them stand over the sink, and squeeze a little into each nostril. I let this work for a minute, and then aspirate, or have them blow their nose. It really works well. Another thing I do is use Vicks Baby Rub (all natural) on their feet w socks. I apply this as often as needed, and it works miracles with coughing.
Hope that helps!