This sometimes helps me when having breathing issues.
1.Get a tub of Vicks chest rub
2.Put a teaspoon of the Vicks in a regular sized bowl
3.Boil the kettle and poor the boiling water in the bowl with the Vicks till its full
4.Get a towel and put it over your head
5.Put your face Centermeters away from the bowl and slowly inhale for about 5-10 mins