My wife was suffering from a bout of sinusitis and a nasty migraine headache over the weekend. I ended up taking her to the emergency room because she was vomiting, dizziness, etc. A real mess. After an IV the migraine subsided and her sinus started to drain. After a few days the sinus was clear, no migraine, but the cold had moved into the chest. One night she was having a coughing fit.
Several of the standard things like honey and concoctions were not helping. I had a thought and went out and grabbed a hand full of yarrow from the yard around midnight. Brought the yarrow in chopped it up and boiled some water. Placed the yarrow in a coffee cup and poured the boiled water over the yarrow. Brought the cup over to my wife and had her cover her head and inhale the steam from the mix. Within fifteen minutes and after a few coughs the spams stopped and she was able to get some sleep. One of yarrow's properties is being antispasmodic which helped her out.
** This is just for informational purposes. Now this worked for my wife and may not work for you. I am just sharing what we did and it seemed to help her.