I Have Asthma I Have Been Told. I Use A

I have asthma I have been told. I use a nebulizer (not as often as I should), I have a rescue inhaler. I have shortness of breath a lot and I can't get rid of this wheezing or feeling of blocked up bronchial tubes. I cough up a lot of stuff sometimes yellow, mostly clear but thick. I have no idea what to do. I don't smoke.