What to do if i have a barking cough after travelling to a country?

Get a diagnosis: The best way to do that is see a doc. Depending on what country you went to, and what your exposures were will start the process of getting a diagnosis, and thus a good treatment. Sometimes, those answers cannot be provided, and treatment has to be given as a 'best guess' approach. If the symptoms are really troublesome, I would try to be seen ASAP. Especially because you don't want to spread this

Get med check.: Mix hot water, 1 tsp. lemon juice & 1 tsp. honey in a mug, then add more lemon juice or honey to taste, if desired. Sip the mixture slowly and inhale the steam from the hot liquid to help reduce congestion in the chest. Or make tea with 2 tsp of Marshmallow root bark per 1cup of hot water (steep in a covered pot for at least 5 minutes). Drink several times a day or as needed to relieve coughing.