My 8 year old daughter has been coughing constantly for over 3 weeks, she also has mild asthma and has a blue and brown inhaler , i have literally tried everything, but shes up all night barking really really bad to a point i am really worried, tried medicines, tried sitting her up, tried vicks vapour rub, she has her inhalers, tried a steam bathroom, nothing is working and her cough has been going on over 3 weeks now and getting worse - please advise, i have also been to a walk in clinic they were useless, her doctors appointment is tomorrow