I went to the emergency doctor for breathing difficulty from a lung infection in November, which continued until December. I pretty much never get a full-on cold or flu. I was prescribed an inhaler to help with the breathing difficulty. After a day or two, I found I was using it too much so I went to see my primary doctor (who I almost never see since... I pretty much never had health issues until November). He gave me a long lasting inhaler and told me to use it every twelve hours for 4-5 days. After using that, I didn't have breathing issues, which let me have a full night's sleep. After 3-4 full night's sleep that allowed my body to heal and I didn't use the inhaler at all again.

You may want to look into it, but because those types of medicines are for chronic sufferers and my use was off-label, my insurance would not pay for it--I understand it is quite expensive. Luckily he had a sample and gave it to me.